Teeth Grinding at Night: Do Night Guards Help

Reviewed 31 August 2026. Every number below is quoted from a named, dated source that is listed with its PMID or document reference at the end: three international consensus papers, a Cochrane review of 57 trials, six systematic reviews and meta-analyses, four randomised trials, three prevalence syntheses and one policy document. Written for people who grind their teeth at night and for the clinicians who see them. Not medical advice.

The short answers

• Bruxism is teeth grinding and clenching — and the current expert definition deliberately calls it a behaviour, not a disease. The 2018 international consensus concluded that in otherwise healthy individuals bruxism “should not be considered as a disorder, but rather as a behaviour that can be a risk (and/or protective) factor for certain clinical consequences”, and that no standard cut-off should be used to declare it present or absent; it should be assessed on a continuum (Lobbezoo et al., J Oral Rehabil 2018-11-01, PMID 29926505). That definition was revised again in 2025: the qualifier “in otherwise healthy individuals” was removed because it caused confusion, and the grading system was reorganised around self-report, clinical examination and device-based measurement (Verhoeff et al., J Oral Rehabil 2025-09-01, PMID 40312776).
• How common depends entirely on how you ask. A 2024 systematic review of studies from 2003 to 2023 pooled a global bruxism prevalence of 22.22% — 21% for sleep bruxism, 23% for awake bruxism — while prevalence estimated by polysomnography came out at 43%. Regional sleep-bruxism figures ran from 19% (Asia) to 31% (North America) (Zieliński et al., J Clin Med 2024-07-01, PMID 39064299). That 21-versus-43 spread is not a contradiction; it is the gap between “someone told me I grind” and “my jaw muscles fired in measurable bursts while I slept”.
• Night guards (occlusal splints) are the most prescribed intervention in this field and the one with the least convincing evidence behind it. The Cochrane review of occlusal interventions for temporomandibular disorders included 57 studies and 2,846 participants, judged only one to be at low risk of bias, and concluded that certainty is very low for every comparison and outcome it examined (Singh et al., Cochrane Database Syst Rev 2024-09-01, PMID 39282765).
• What the Cochrane data did show is uncomfortable but useful: a hard stabilisation splint produced a real reduction in muscle pain when chewing against no treatment (mean difference −1.97, 95% CI −2.37 to −1.57, one study, 84 participants), yet against low-level laser it was no different (RR 0.17, 95% CI 0.02 to 1.26) and against acupuncture also no different (MD 0.10, 95% CI −0.80 to 1.00) (Singh et al., Cochrane Database Syst Rev 2024-09-01, PMID 39282765). All four of those intervals are wide, and the second and third cross zero.
• A separate systematic review of 13 studies (589 patients with orofacial muscle pain) found the opposite kind of problem: every included study was at high risk of bias, and the authors concluded there is insufficient evidence that splint therapy offers an advantage over other interventions or over doing nothing (Orzeszek et al., BMC Oral Health 2023-03-01, PMID 36978070).
• Splints protect teeth from wear; there is no good evidence that they stop the grinding. A systematic review of 15 studies comparing splint designs reported that adjustable devices such as full-occlusion biofeedback splints reduced measured bruxism episodes more than passive ones, while conventional acrylic splints mainly served to distribute force and reduce symptoms (Ainoosah et al., BMC Oral Health 2024-01-01, PMID 38182999).
• If you were told that grinding means you have parasites, the honest answer is “there is one association, it is weak, and it cannot tell you what caused what”. In a comparative cross-sectional study of 450 children in Alexandria, Egypt, parent-reported bruxism was significantly more common among children whose stool tested positive (AOR 2.08, 95% CI 1.32 to 3.29), with similar associations for tooth wear (AOR 1.64, 95% CI 1.08 to 2.47) and mild temporomandibular disorder (AOR 1.85, 95% CI 1.23 to 2.80) (Rabie et al., BMC Oral Health 2026-06-01, PMID 42243845).
• Botulinum toxin has the loudest marketing and the weakest reporting integrity in this area. A meta-epidemiologic study of randomised trials of botulinum toxin for bruxism found spin bias — favourable conclusions drawn from unfavourable or underpowered results — in 59.4% of trials, and in 87.5% of the main-text conclusions specifically. Its clinical-significance note says the temporalis injections did not reduce muscle activity at all, masseter results “remain controversial”, and “it is not possible to have certainty about the efficacy and safety” (De Luca Canto et al., BMC Med Res Methodol 2025-05-01, PMID 40340732).
• In the US you should expect to pay out of pocket. Utah’s Medicaid children’s dental benefit explicitly lists treatment of jaw joint problems, including occlusal appliances and night guards, as non-covered (data as of 04 Feb 2026; see Additional documents).

What bruxism is — and what the experts decided it is not

The word is used for three different things in ordinary conversation: the noise your partner hears, the flat shiny facets your dentist sees, and the muscle soreness you wake up with. The research literature tried to sort this out, and the sorting matters for everything that follows.

The 2013 and then 2018 consensus work defined bruxism as repetitive masticatory muscle activity, characterised by clenching or grinding of the teeth and/or bracing or thrusting of the mandible, and split it into two behaviours measured differently: sleep bruxism (rhythmic or non-rhythmic activity during sleep) and awake bruxism (repetitive or sustained tooth contact and/or bracing during wakefulness). The 2018 report made three decisions that are worth quoting, because they contradict how bruxism is sold to patients (Lobbezoo et al., J Oral Rehabil 2018-11-01, PMID 29926505):

• Bruxism is a behaviour, not a disorder, in otherwise healthy people — a possible risk factor, and possibly protective, but not itself the disease.
• Both non-instrumental assessment (chiefly self-report) and instrumental assessment (chiefly electromyography) are legitimate ways to measure it.
• Standard cut-off points for “has bruxism” versus “does not” should not be used in healthy individuals; muscle activity should be assessed along a continuum.

In 2025 an international consensus meeting updated the definitions again: the “in otherwise healthy individuals” qualifier was dropped, and the grading system was revised to state plainly which evidence level a claim rests on — self-report, clinical examination, or device-based assessment (Verhoeff et al., J Oral Rehabil 2025-09-01, PMID 40312776). An explanatory note published after five years of use of the 2018 definitions argued the same direction, that the definitions needed clarifying rather than defending (Manfredini et al., J Oral Rehabil 2024-03-01, PMID 37994212).

Practical consequence: when a headline says “bruxism affects 22% of people”, it is reporting a mixture of questionnaires, clinical wear scoring and sleep-lab counts, and those are not the same condition. When your dentist says “you grind”, they are usually inferring a behaviour from a tooth surface. That inference is reasonable; it is not a measurement.

How many people, and how sure are we

The 2024 prevalence synthesis is the most current large picture: studies published between 2003 and 2023, PubMed plus manual and snowball searching, double quality appraisal with a Joanna Briggs Institute checklist, analysis in R. Pooled figures: global bruxism 22.22%, sleep bruxism 21%, awake bruxism 23%, and 43% for sleep bruxism identified by polysomnography. By region, sleep bruxism ran 31% (North America), 23% (South America), 21% (Europe), 19% (Asia); awake bruxism 30% (South America), 25% (Asia), 18% (Europe). The authors’ own limitation list is important: they could not analyse Africa or Australia for lack of adequate samples, and they note that one in four people may experience awake bruxism (Zieliński et al., J Clin Med 2024-07-01, PMID 39064299).

Now the children, because the numbers there are worse, not better. A 2013 systematic review found 22 publications on childhood sleep bruxism but was able to extract prevalence from only eight, because the rest had external-validity problems; every one of those eight diagnosed sleep bruxism from parent proxy reports, and none had epidemiological data from polysomnography or electromyography. The reported prevalence ran from 3.5% to 40.6%, with a commonly described decrease with age and no gender difference — which is why the reviewers declined to produce any single estimate (Manfredini et al., J Oral Rehabil 2013-08-01, PMID 23700983). A second review, searching MEDLINE, Cochrane, EMBASE, PubMed, Lilacs and BBO from January 2000 to February 2013, found just four studies meeting its criteria, with prevalence from 5.9% to 49.6%, and attributed the spread to the diagnostic criteria used (Machado et al., Dental Press J Orthod 2014-11-01, PMID 25628080). A 2022 paediatric review summarised the field as “affects between 6 and 30% of children and adolescents”, rising with age, peaking at 10 to 14 years, and falling into adulthood (Casazza et al., Arch Pediatr 2022-01-01, PMID 34955303).

Read those three together. For adults there is at least a pooled number with a method attached. For children there is a range whose width is mostly explained by the question you ask a parent — and an “is worse than useless” spread of 3.5% to 49.6% means that no child’s grinding should be treated as abnormal on prevalence grounds alone.

How to tell whether you actually do it

The honest starting point is that there is no cheap, accepted diagnostic. Polysomnography with audiovisual recording and jaw-muscle electromyography is the reference standard, and it is not available outside a sleep lab. What the diagnostic-accuracy literature tells you is how much to trust the tools that are available.

In a study designed specifically to check whether the International Classification of Sleep Disorders (third edition) criteria could identify sleep bruxism without a lab, twenty participants each had an interview, a clinical examination and a polysomnogram, with bruxer status determined only by the sleep study. The answer was only fair to moderate agreement: areas under the curve between 0.55 and 0.75 across criteria items. The two combinations that performed best were grinding more than once a week together with transient morning jaw muscle pain or fatigue (AUC 0.75, 90% specificity, positive likelihood ratio 6, diagnostic odds ratio 13.5), and grinding more than four times a week together with tooth wear (AUC 0.75, positive likelihood ratio 6, diagnostic odds ratio 13.6) (Stuginski-Barbosa et al., J Prosthet Dent 2017-01-01, PMID 27460312). Twenty participants. Treat those likelihood ratios as a signal worth testing in a bigger sample, not as a diagnostic rule.

Portability is no better. A prospective two-gate study of an ambulatory device (Sleep Profiler) against reference polysomnography — ten people with probable sleep bruxism and ten healthy volunteers, recorded simultaneously overnight — found median sensitivity of 0.825 but positive predictive values around 0.6, meaning roughly 40% of the bruxism episodes the portable device scored were false positives. Correcting this required raising the episode and burst index cut-offs by about 1.5 times (Abe et al., J Clin Sleep Med 2023-02-01, PMID 36305587). So if you bought a wrist-and-jaw tracker and it told you that you ground 400 times last night, divide that number in your head before you panic.

What the sleep-lab data do add is anatomical, and it is thin: a case-control study that recruited 20 polysomnography-confirmed bruxers and 20 age- and sex-matched controls found temporomandibular joint sounds in 35% versus 5% (p = 0.017) and left-side balancing occlusal interferences more often (p = 0.04). Multivariable analysis gave a moderate correlation between bruxism and the combination of joint sound plus occlusal inclination (COR 0.39, 95% CI 0.19 to 0.57) (Aristizabal-Hoyos et al., J Clin Med 2025-09-01, PMID 41095812). Forty people total. This is a hypothesis generator about occlusion and joint noise, not a basis for grinding your teeth down to change your bite.

The night guard, examined

What a hard stabilisation splint is: a milled or formed acrylic appliance covering the teeth of one arch, usually the upper, which gives both arches a smooth, even surface to move on. What it is supposed to do, in order of how well the evidence supports it:

1. Protect the tooth surface

This is the claim with the most plausibility behind it, because the mechanism is simple: something sacrificial takes the wear instead of enamel. The literature on the materials, however, shows that “a night guard” is not one thing. A systematic review of wear testing of splint materials — 115 studies identified after duplicates, 11 finally selected — found the lowest volumetric loss in PEEK devices, no significant difference between heat-cured, CAD-milled and 3D-printed materials, and the highest wear in vacuum-formed materials, while also reporting that the testing protocols were inconsistent enough to threaten comparability, and that polishing is not optional (Grymak et al., J Prosthodont 2022-07-01, PMID 34516696). Translated into a purchase decision: the boil-and-bite guard from a pharmacy is the version with the most documented wear, and the lab-milled hard appliance is not the same product.

2. Reduce pain and symptoms

This is where the Cochrane review bites. Fifty-seven studies, 2,846 participants, mostly evaluating the full hard stabilisation splint, study durations from five weeks to 84 months, and the key results measured between 4.4 weeks and four months. Certainty: very low for all comparisons and outcomes (Singh et al., Cochrane Database Syst Rev 2024-09-01, PMID 39282765). The specific contrasts:

• Self-reported joint pain when chewing, splint versus a placebo (non-occlusal) splint: RR 1.88, 95% CI 0.94 to 3.75 — one study, 60 participants, and the interval crosses zero, so sham-controlled benefit is unproven in either direction.
• Splint versus pharmacological treatment (diclofenac) in osteoarthritis: RR 2.10, 95% CI 0.83 to 5.30 — 29 participants, again crossing zero.
• Muscle pain when chewing, splint versus no treatment: MD −1.97, 95% CI −2.37 to −1.57 — one study, 84 participants with disc displacement without reduction. This is the strongest single favourable result in the review, and it is one study against doing nothing.
• Splint versus physical therapy (low-level laser): RR 0.17, 95% CI 0.02 to 1.26 — 40 participants. Splint versus acupuncture: MD 0.10, 95% CI −0.80 to 1.00 — 40 participants. Muscle pain at rest versus no treatment: MD −11.63, 95% CI −29.37 to 6.11 — 37 participants. Versus physiotherapy: MD −0.19, 95% CI −1.25 to 0.87 — 72 participants (Singh et al., Cochrane Database Syst Rev 2024-09-01, PMID 39282765).

One non-Cochrane meta-analysis is more positive, and its limits are visible: eight randomised trials, more than 400 participants, pain measured on a visual analogue scale, pooled standardised mean difference favouring centric stabilisation splints over other conservative treatments of 0.75 (95% CI 0.32 to 1.18), with the authors explicitly scoping the finding to short-term relief in myogenous temporomandibular disorder and calling long-term outcomes unverified (Gupta et al., Saudi Dent J 2025-10-01, PMID 41091278). The same pattern appears inside the primary literature: a randomised pilot trial comparing an Okeson-type appliance with a bimaxillary splint over 30 days, with pressure pain threshold measured before and after, found similar pain-factor reduction in both groups regardless of design, and concluded that canine guidance and no guidance were similarly effective at increasing pain resilience (Dalewski et al., J Clin Med 2021-05-01, PMID 34071832). In other words, whether your guard has fancy guidance ramps may matter much less than the act of wearing something hard between the teeth.

3. Stop the grinding

It mostly does not. The comparison review of 15 studies found that only adjustable, actively functioning splint types (biofeedback splints among them) were more effective in reducing sleep bruxism episodes and improving patient-reported symptoms, with effects on electromyographic activity varying by device and adverse effects needing individual consideration (Ainoosah et al., BMC Oral Health 2024-01-01, PMID 38182999). That is a meaningful distinction the retail market ignores: a passive guard is a shield; it is not a switch.

4. Digital versus conventional

A 2026 systematic review of randomised trials comparing digitally designed and manufactured splints with conventional ones screened 2,115 records and included eight, with most at low to moderate risk of bias. It reported a tendency toward better outcomes with digital splints that was not statistically significant (Saini et al., BDJ Open 2026-05-01, PMID 42103707). If a clinic quotes you a much higher price for a “fully digital” guard, the trial evidence does not yet support a large quality difference — you are paying partly for workflow.

The other things on offer, and what they cost you in certainty

Botulinum toxin type A. A systematic review of randomised trials, searching PubMed, Scopus, Web of Science and CENTRAL to 1 February 2024, found 12 studies with acceptable bias ratings (low in 10, moderate in 2), comparing injections into masseter, temporalis and medial pterygoid against saline, splints or conventional care. Six of the twelve reported reduced muscle activity on rhythmic masticatory muscle activity or electromyography, three reported a significant drop in pain intensity on the visual analogue scale, and one reported better sleep quality — the authors’ conclusion being that toxin can reduce symptoms but that heterogeneity and methodological differences mean large, long, repeat-dose trials are still needed (Yacoub et al., Dent Med Probl 2025-01-01, PMID 40035138). Against that, read the spin analysis above (De Luca Canto et al., BMC Med Res Methodol 2025-05-01, PMID 40340732). Two things to conclude: pain reduction over weeks to a year is plausible, muscle activity reduction is inconsistent, and the effect is not on grinding but on the muscle’s ability to generate force — with the cost, the temporary nature, and the aesthetic drift (masseter thinning changes how a face looks) included in the price.

Behavioural treatment for daytime clenching. There are no official guidelines for awake bruxism; a 2026 systematic review of its management says so directly, and quantifies the evidence base: after screening 4,358 abstracts and reading 210 full texts, nine studies with 165 participants were included, most of them testing strategies within cognitive behavioural therapy, and although they carried varying risks of bias they generally suggested positive effects (Graham et al., BMC Oral Health 2026-02-01, PMID 41735990). One hundred and sixty-five participants is a very small evidence base for a behaviour reported by roughly one person in four.

Toxin versus biofeedback, head to head. In a single-centre, single-blind randomised trial, 40 adults with temporomandibular disorder and awake bruxism (entry criterion: clenching frequency of 60% or more of sampled moments, measured by smartphone ecological momentary assessment) were allocated to electromyographic biofeedback or botulinum toxin. Within the biofeedback group, sustained tooth contact fell significantly (p = 0.004) and the momentary-assessment global behaviour score fell (p = 0.008); the toxin group showed no significant change in the same variables; and between groups there were no significant differences at one, three or six months (Foscaldo et al., BMC Oral Health 2025-11-01, PMID 41219710). Forty people, one city, one clinician group. But it is the only direct comparison type of trial in the field, and it did not favour the expensive injection.

Children. The evidence there is effectively absent for treatment. A systematic review of management of idiopathic sleep bruxism in children and adolescents found only eight studies between January 2006 and December 2020 that met quality criteria, spanning occlusal splints, palatal expansion and pharmacological treatment, with protocols too different to compare; its recommendation was not a device but a process — paediatrician, ear, nose and throat / airway specialist and dentist working together, case by case (Casazza et al., Arch Pediatr 2022-01-01, PMID 34955303). An umbrella review — the level above systematic reviews — found 444 articles, kept six reviews, rated all of them at high risk of bias, judged overlap between them very high, and concluded that while associated factors (sleep conditions, respiratory changes, personality traits, psychosocial factors) are consistently reported, “there is currently insufficient evidence to make recommendations for specific treatment options” (Scarpini et al., Braz Oral Res 2023-01-01, PMID 36629590).

The one thing in childhood grinding that has a real signal is the airway, not the teeth. A systematic review of the bruxism–obstructive sleep apnoea relationship, screening four databases for 2020–2025 and appraising with ROBINS-I and GRADE, kept 11 studies and found sleep bruxism prevalence consistently higher in people with apnoea than in the general population, with proposed shared mechanisms in autonomic arousals and neurotransmitter regulation, while warning that inconsistent diagnostic criteria and moderate methodological quality cap the strength of any conclusion. It also places the sizes: bruxism incidence 8% to 31%, apnoea affecting 4% to 6% of middle-aged men and 2% to 4% of middle-aged women (Doblado et al., J Clin Med 2025-07-01, PMID 40725707). If your child grinds loudly, snores, mouth-breathes or is restless, the highest-value appointment in that list is not about teeth.

What the grinding is doing to your teeth

Two claims that get made constantly, and what the verified literature supports:

• “Grinding wears my teeth flat.” Yes, and this is the main reason to bother with any intervention: it is the outcome with a plausible mechanism, a visible clinical sign and consistency across sources. The caveat is measurement — in the Egypt study, tooth wear was quantified with an index (mean 2.72 affected teeth in the infected group versus 2.50 in the uninfected group), and the authors reported an adjusted association of 1.64 for wear with parasitic infection (Rabie et al., BMC Oral Health 2026-06-01, PMID 42243845); indices of that kind are noisy, and a 0.2-tooth difference is not a diagnosis.
• “Grinding broke my filling/crown.” Plausible, poorly quantified. The awake-bruxism review lists fractures of dental restorations among the possible consequences of the behaviour (Graham et al., BMC Oral Health 2026-02-01, PMID 41735990), and the splint-materials review exists precisely because material wear against teeth is measurable but restoration fracture rates are not (Grymak et al., J Prosthodont 2022-07-01, PMID 34516696).

What is not supported by the material we verified: that grinding causes periodontitis, that it causes tooth loss by itself, that treating it cures headaches, or that a flattened bite has to be rebuilt to a new vertical dimension. The last of those belongs in an orthodontic/prosthodontic consultation, not in an anxiety spiral — and see our companion piece on clear aligners versus braces for what the evidence does and does not support about moving teeth to change a bite.

The two ideas that will cost you money

“Your grinding is from stress, so fix the stress.” Directionally defensible, quantitatively unproven in the papers here. What is documented is a stress measurement problem: in the Jordanian cross-sectional survey of 1,373 young adults, 309 (22.5%) used energy drinks daily, self-reported bruxism behaviours were present in 19.4% of consumers with another 26.9% suspecting them, jaw pain on waking was reported by 41.1% (n = 127), and daily consumption was significantly associated with self-reported bruxism (χ² = 115.6, adjusted p = 0.001) after adjusting for age, sex, smoking and perceived stress (Sharaireh et al., J Clin Med 2025-12-01, PMID 41517452). A cross-sectional survey cannot tell you whether stimulants cause grinding, whether stressed people both drink and grind, or whether the two simply co-occur. It does tell you that caffeine and taurine load is one of the few modifiable exposures in this literature — and it is free to change.

“Wear a guard and your joint will heal.” The best sham-controlled result we could verify is an interval crossing zero for joint pain when chewing (Singh et al., Cochrane Database Syst Rev 2024-09-01, PMID 39282765). A guard is a wear-protection device with an unproven joint effect, and it is worth buying for the wear.

How to read this like a clinician

• Grade your own certainty. Use the consensus structure: state whether each claim rests on self-report, clinical examination or device-based measurement, and do not present a wear facet as an EMG finding (Lobbezoo et al., J Oral Rehabil 2018-11-01, PMID 29926505) (Verhoeff et al., J Oral Rehabil 2025-09-01, PMID 40312776).
• Do not create a diagnosis where a behaviour exists. The 2018 consensus explicitly rejected standard cut-offs in healthy individuals — the clinical question is not “does this patient have bruxism” but “is the amount of muscle activity producing or threatening damage, and what is the trajectory”.
• Screen the airway and the sleep, then decide about the mouth. Where sleep bruxism and obstructive sleep apnoea coexist, prevalence data support looking, and diagnostic criteria inconsistency is the acknowledged limitation (Doblado et al., J Clin Med 2025-07-01, PMID 40725707). In children the same logic is stronger: the systematic reviews kept coming back to respiratory and sleep factors and to multidisciplinary assessment rather than appliances (Casazza et al., Arch Pediatr 2022-01-01, PMID 34955303) (Scarpini et al., Braz Oral Res 2023-01-01, PMID 36629590).
• Frame the guard correctly in the note and to the patient: protection of tooth structure and restorations, symptom reduction in myogenous pain with very-low-certainty evidence, no demonstrated suppression of the behaviour with passive devices (Ainoosah et al., BMC Oral Health 2024-01-01, PMID 38182999) (Singh et al., Cochrane Database Syst Rev 2024-09-01, PMID 39282765) (Orzeszek et al., BMC Oral Health 2023-03-01, PMID 36978070).
• Choose material on evidence, not on price tier. PEEK lowest volumetric loss; vacuum-formed worst; heat-cure, CAD-milled and 3D-printed statistically indistinguishable; inconsistent protocols in this whole sub-literature (Grymak et al., J Prosthodont 2022-07-01, PMID 34516696). Digital manufacture: favourable trend, not significant (Saini et al., BDJ Open 2026-05-01, PMID 42103707).
• Botulinum toxin: if used, state the outcome you expect (force, pain) and not the outcome you cannot support (episode frequency), and document that the trial evidence at 40-person scale does not beat behavioural therapy on between-group differences (Yacoub et al., Dent Med Probl 2025-01-01, PMID 40035138) (Foscaldo et al., BMC Oral Health 2025-11-01, PMID 41219710) (De Luca Canto et al., BMC Med Res Methodol 2025-05-01, PMID 40340732).
• Follow-up interval: the pain data in the Cochrane review mostly live between 4.4 weeks and four months (Singh et al., Cochrane Database Syst Rev 2024-09-01, PMID 39282765). Review at three months, not at three years.

Cost and coverage, with the local numbers

In Utah’s Medicaid programme for children, the published benefit summary is explicit that treatment for temporomandibular joint syndrome — including therapy and occlusal appliances, i.e. night guards — is a non-covered dental service, while treatment of temporomandibular joint fractures is covered (Summary of Benefits Report for Utah, Medicaid; data as of 04 February 2026). Preventive services that are covered in the same document are worth knowing, because they are where the money is: two cleanings per calendar year; fluoride treatments including varnish up to four times per calendar year, applied by a doctor at a well-child visit for children under five and in a dental office from age five; sealants once every two years per tooth on first and second permanent molars and premolars where the tooth has no existing decay or fillings; silver diamine fluoride for children with baby teeth once every six months per tooth; stainless steel crowns once every two years per tooth for teeth with large cavities or after a pulpotomy; emergency treatment of an abscess without prior authorisation. Orthodontics requires prior authorisation via the state IOTN score sheet and is limited to once per lifetime, with retainers covered once per lifetime at the end of treatment.

Practical translation: for a child in Utah Medicaid, a night guard will be a self-pay item, while the sealants, varnish and SDF that address the two conditions actually covered and provably prevented are free within frequency limits. That asymmetry is not a conspiracy; it reflects the evidence ranking we just walked through — the preventive items have Cochrane reviews with intervals away from zero, and the appliance mostly does not (Ahovuo-Saloranta et al., Cochrane Database Syst Rev 2017-07-01, PMID 28759120) (Singh et al., Cochrane Database Syst Rev 2024-09-01, PMID 39282765).

Evidence at a glance

Question	Best available estimate	Certainty, as rated by the source
How common is bruxism (all forms)?	22.22% pooled; 21% sleep, 23% awake; 43% by polysomnography (Zieliński et al., J Clin Med 2024-07-01, PMID 39064299)	Not graded; definitional heterogeneity is the stated limitation
How common in children?	3.5%–40.6% across 8 usable studies (Manfredini et al., J Oral Rehabil 2013-08-01, PMID 23700983); 5.9%–49.6% across 4 (Machado et al., Dental Press J Orthod 2014-11-01, PMID 25628080); 6%–30% narrative (Casazza et al., Arch Pediatr 2022-01-01, PMID 34955303)	Reviewers refused a pooled estimate
Can self-report diagnose sleep bruxism?	AUC 0.55–0.75 versus polysomnography; best combination AUC 0.75, +LR 6 (Stuginski-Barbosa et al., J Prosthet Dent 2017-01-01, PMID 27460312)	Preliminary; n = 20
Does a splint reduce joint pain when chewing vs sham?	RR 1.88, 95% CI 0.94 to 3.75 (Singh et al., Cochrane Database Syst Rev 2024-09-01, PMID 39282765)	Very low
Does a splint reduce muscle pain when chewing vs nothing?	MD −1.97, 95% CI −2.37 to −1.57 (Singh et al., Cochrane Database Syst Rev 2024-09-01, PMID 39282765)	Very low; single study
Does splint beat laser or acupuncture?	RR 0.17 (0.02–1.26); MD 0.10 (−0.80 to 1.00) (Singh et al., Cochrane Database Syst Rev 2024-09-01, PMID 39282765)	Very low; both cross zero
Does a splint reduce bruxism episodes?	Only adjustable/biofeedback designs (Ainoosah et al., BMC Oral Health 2024-01-01, PMID 38182999)	15 heterogeneous studies
Does botulinum toxin reduce muscle activity?	6 of 12 studies positive; 3 of 12 positive for pain (Yacoub et al., Dent Med Probl 2025-01-01, PMID 40035138)	High risk of misreporting: 59.4% spin (De Luca Canto et al., BMC Med Res Methodol 2025-05-01, PMID 40340732)
Toxin versus biofeedback for daytime clenching	Within-group improvement for biofeedback only; no between-group difference (Foscaldo et al., BMC Oral Health 2025-11-01, PMID 41219710)	n = 40, single centre, single-blind
Any treatment proven for children?	“Insufficient evidence to make recommendations for specific treatment options” (Scarpini et al., Braz Oral Res 2023-01-01, PMID 36629590)	All six included reviews at high risk of bias

What the evidence does not support

• That a night guard treats bruxism. Passive splints do not reliably reduce measured episodes; they interpose a surface (Ainoosah et al., BMC Oral Health 2024-01-01, PMID 38182999).
• That a splint outperforms doing nothing for joint pain, or outperforms physiotherapy, laser or acupuncture for muscle pain. The sham-controlled interval crosses zero and the active-comparator intervals are wide and null (Singh et al., Cochrane Database Syst Rev 2024-09-01, PMID 39282765) (Orzeszek et al., BMC Oral Health 2023-03-01, PMID 36978070).
• That any appliance design is clearly better than another. Two splint designs performed alike over 30 days in the one randomised comparison we verified on pain thresholds (Dalewski et al., J Clin Med 2021-05-01, PMID 34071832); digital versus conventional showed a non-significant trend (Saini et al., BDJ Open 2026-05-01, PMID 42103707).
• That botulinum toxin is established for bruxism. The pooled view of the trials, from an independent methodological analysis, is that efficacy and safety cannot be stated with certainty and that conclusions were frequently over-sold (De Luca Canto et al., BMC Med Res Methodol 2025-05-01, PMID 40340732).
• That childhood grinding needs dental treatment, or that parasites are a cause you should be treating. In children, treatment recommendations cannot be supported at all (Scarpini et al., Braz Oral Res 2023-01-01, PMID 36629590); the parasite association is cross-sectional, single-site, parent-reported-outcome and adjusted for a baseline age difference between groups (Rabie et al., BMC Oral Health 2026-06-01, PMID 42243845). If a child’s stool tests positive, treat the infection — but do not expect the grinding to be its symptom.
• That occlusal adjustment — grinding teeth down, or changing a bite to “balance” it — treats bruxism. Nothing in the verified material supports this, and the case-control occlusal findings are correlation-sized, n = 40 (Aristizabal-Hoyos et al., J Clin Med 2025-09-01, PMID 41095812).
• That prevalence numbers can tell you whether your own grinding is abnormal. The child literature spans 3.5% to 49.6% purely on the strength of the definition used (Manfredini et al., J Oral Rehabil 2013-08-01, PMID 23700983).

A plan, if you want one

• Week 0–1. Answer three questions in writing: is there pain (jaw, temple, ear region, on waking or when chewing); is there visible wear or a chipped restoration; is there snoring, gasping, witnessed pauses or unrefreshing sleep. The third group of answers outranks the first two for what to do next.
• Reduce the cheap things first. Caffeine and stimulant load (the only modifiable exposure with a cross-sectional signal here (Sharaireh et al., J Clin Med 2025-12-01, PMID 41517452)), plus a hard look at sleep quantity — sleep conditions are the associated factor that keeps surviving in the children’s literature (Scarpini et al., Braz Oral Res 2023-01-01, PMID 36629590).
• Get the surfaces protected. A lab-made hard full-coverage upper appliance, polished, reviewed at three months. Buy it as a wear shield, with symptom relief as an unproven bonus (Grymak et al., J Prosthodont 2022-07-01, PMID 34516696) (Singh et al., Cochrane Database Syst Rev 2024-09-01, PMID 39282765).
• If pain is the main complaint, ask for a physiotherapy-first pathway before an appliance-first one, since the review data put splint and physical therapy intervals on top of each other (Singh et al., Cochrane Database Syst Rev 2024-09-01, PMID 39282765), and consider awake-bruxism awareness work, which is the only intervention family with a plausible behavioural signal for daytime clenching (Graham et al., BMC Oral Health 2026-02-01, PMID 41735990).
• For a child, the plan is: paediatrician and airway review, no appliance by default, and a dental review focused on whether wear is actually progressing year over year — because there is no evidence-based treatment to offer otherwise (Casazza et al., Arch Pediatr 2022-01-01, PMID 34955303) (Scarpini et al., Braz Oral Res 2023-01-01, PMID 36629590).
• Re-measure. Photograph the wear facets at baseline and at 12 months. If nothing is progressing and pain is acceptable, doing less is a legitimate outcome.

Frequently asked questions

Do night guards weaken my jaw or make grinding worse? Nothing in the verified material supports a lasting weakening. What exists is the caution that effects are small and short-term, that adverse effects “should be considered individually” with adjustable devices (Ainoosah et al., BMC Oral Health 2024-01-01, PMID 38182999), and that the whole comparative literature carries a rating of very low certainty (Singh et al., Cochrane Database Syst Rev 2024-09-01, PMID 39282765).

Is a pharmacy guard better than nothing? For protecting enamel, probably partially — but vacuum-formed materials had the highest wear in the materials review, which means the guard itself wears and needs replacement (Grymak et al., J Prosthodont 2022-07-01, PMID 34516696).

Will Botox fix it? Expect a force and pain effect that fades, from trials of around forty people, in a literature where most published conclusions overstate their own results (Yacoub et al., Dent Med Probl 2025-01-01, PMID 40035138) (Foscaldo et al., BMC Oral Health 2025-11-01, PMID 41219710) (De Luca Canto et al., BMC Med Res Methodol 2025-05-01, PMID 40340732).

My child grinds. Should I do something? First: at 3.5% to 40.6% reported prevalence, childhood grinding is common (Manfredini et al., J Oral Rehabil 2013-08-01, PMID 23700983). Second: no treatment option has enough evidence to be recommended (Scarpini et al., Braz Oral Res 2023-01-01, PMID 36629590). Third and most useful: check the sleep and airway, and keep the routine dental prevention that is covered and provably effective going (Casazza et al., Arch Pediatr 2022-01-01, PMID 34955303).

Is grinding damaging my teeth right now? The measurement that answers this is a longitudinal comparison of your own wear, not a population statistic — take a good photo once a year.

Does stress cause it? Stress is consistently reported as associated and rarely proven as causal; the awake-bruxism literature’s own framing is behaviour on a continuum rather than a stress-triggered disease (Lobbezoo et al., J Oral Rehabil 2018-11-01, PMID 29926505).

Is grinding a sleep disorder? It is scored during sleep, and current consensus treats it as a behaviour rather than a disorder in healthy people — but with a documented association to apnoea worth screening for (Lobbezoo et al., J Oral Rehabil 2018-11-01, PMID 29926505) (Doblado et al., J Clin Med 2025-07-01, PMID 40725707).

Glossary: bedroom words ↔ clinic words

What you say at home	What the chart says	How it is actually measured
“I grind in my sleep”	Sleep bruxism (rhythmic or non-rhythmic masticatory muscle activity)	Polysomnography with EMG; or self-report plus clinical signs, with only fair-to-moderate agreement (Lobbezoo et al., J Oral Rehabil 2018-11-01, PMID 29926505) (Stuginski-Barbosa et al., J Prosthet Dent 2017-01-01, PMID 27460312)
“I clench during the day”	Awake bruxism (repetitive or sustained tooth contact, bracing/thrusting)	Ecological momentary assessment, Oral Behavior Checklist, EMG (Foscaldo et al., BMC Oral Health 2025-11-01, PMID 41219710)
“My teeth are wearing down”	Attrition / tooth wear facets	Wear indices (e.g. tooth-level counts and scores) (Rabie et al., BMC Oral Health 2026-06-01, PMID 42243845)
“My jaw clicks”	Temporomandibular joint sound	Clinical auscultation/palpation; more frequent in PSG-confirmed bruxers in a 40-person case-control (Aristizabal-Hoyos et al., J Clin Med 2025-09-01, PMID 41095812)
“My guard”	Occlusal / stabilisation splint, full hard stabilisation splint	Material, wear and retention reported per study; designs vary in evidence (Grymak et al., J Prosthodont 2022-07-01, PMID 34516696) (Saini et al., BDJ Open 2026-05-01, PMID 42103707)
“The jaw muscle injection”	Botulinum toxin type A, masseter/temporalis	Pain VAS, EMG/RMMA, ultrasound muscle thickness (Yacoub et al., Dent Med Probl 2025-01-01, PMID 40035138) (Taşdemir et al., J Oral Maxillofac Surg 2025-12-01, PMID 40935351)
“Muscle pain”	Myogenous TMD / myofascial pain	Pressure pain threshold, VAS, palpation (Dalewski et al., J Clin Med 2021-05-01, PMID 34071832) (Orzeszek et al., BMC Oral Health 2023-03-01, PMID 36978070)
“My kid’s grinding”	Paediatric sleep bruxism, usually proxy-reported	Parent report only in every epidemiological study reviewed (Manfredini et al., J Oral Rehabil 2013-08-01, PMID 23700983)

Related reading on this site: whether you actually need that filling, what the water-fluoridation evidence actually shows and whether baby teeth should be filled, capped or extracted.

How this page was built, and what it cannot tell you

We searched Europe PMC for the highest-level syntheses on this topic, then pulled each record programmatically — authors, journal, volume, issue, pages, DOI, open-access status and citation count — and read the abstracts in full, quoting only numbers that appear in them. Where a review graded its own evidence (Cochrane uses GRADE), we reproduce that grade instead of our own opinion. Where a confidence interval crosses zero we say so in the sentence carrying the number. Where a study is small, we state n: much of this literature is built on samples of 20 to 84 participants per comparison, which is why the certainty ratings read “very low”.

What this page cannot tell you: your own risk of tooth fracture or wear rate; whether your insurance will reimburse an appliance; what an appropriate price is in your city; or whether the sleep-disordered breathing signal in the bruxism literature applies to your snoring. Those require an examination, and for the sleep part a sleep study.

Sources

Peer-reviewed evidence

• Manfredini D, Restrepo C, Diaz-Serrano K, Winocur E, Lobbezoo F. Prevalence of sleep bruxism in children: a systematic review of the literature. J Oral Rehabil 2013-08-01;40(8):631-642. doi:10.1111/joor.12069 · PMID 23700983 · cited by 164 (Europe PMC)
• Machado E, Dal-Fabbro C, Cunali PA, Kaizer OB. Prevalence of sleep bruxism in children: a systematic review. Dental Press J Orthod 2014-11-01;19(6):54-61. doi:10.1590/2176-9451.19.6.054-061.oar · PMID 25628080 · PMCID PMC4347411 · open access · cited by 82 (Europe PMC)
• Stuginski-Barbosa J, Porporatti AL, Costa YM, Svensson P, Conti PC. Agreement of the International Classification of Sleep Disorders Criteria with polysomnography for sleep bruxism diagnosis: A preliminary study. J Prosthet Dent 2017-01-01;117(1):61-66. doi:10.1016/j.prosdent.2016.01.035 · PMID 27460312 · cited by 46 (Europe PMC)
• Ahovuo-Saloranta A, Forss H, Walsh T, Nordblad A, Mäkelä M, Worthington HV. Pit and fissure sealants for preventing dental decay in permanent teeth. Cochrane Database Syst Rev 2017-07-01;7():CD001830. doi:10.1002/14651858.cd001830.pub5 · PMID 28759120 · PMCID PMC6483295 · cited by 204 (Europe PMC)
• Lobbezoo F, Ahlberg J, Raphael KG, Wetselaar P, Glaros AG, Kato T, Santiago V, Winocur E, De Laat A, De Leeuw R, Koyano K, Lavigne GJ, Svensson P, Manfredini D. International consensus on the assessment of bruxism: Report of a work in progress. J Oral Rehabil 2018-11-01;45(11):837-844. doi:10.1111/joor.12663 · PMID 29926505 · PMCID PMC6287494 · open access · cited by 870 (Europe PMC)
• Dalewski B, Kamińska A, Kiczmer P, Węgrzyn K, Pałka Ł, Janda K, Sobolewska E. Pressure Algometry Evaluation of Two Occlusal Splint Designs in Bruxism Management-Randomized, Controlled Clinical Trial. J Clin Med 2021-05-01;10(11):2342. doi:10.3390/jcm10112342 · PMID 34071832 · PMCID PMC8198302 · open access · cited by 20 (Europe PMC)
• Grymak A, Aarts JM, Ma S, Waddell JN, Choi JJE. Wear Behavior of Occlusal Splint Materials Manufactured By Various Methods: A Systematic Review. J Prosthodont 2022-07-01;31(6):472-487. doi:10.1111/jopr.13432 · PMID 34516696 · cited by 26 (Europe PMC)
• Casazza E, Giraudeau A, Payet A, Orthlieb JD, Camoin A. Management of idiopathic sleep bruxism in children and adolescents: A systematic review of the literature. Arch Pediatr 2022-01-01;29(1):12-20. doi:10.1016/j.arcped.2021.11.014 · PMID 34955303 · cited by 11 (Europe PMC)
• Abe Y, Nakazato Y, Takaba M, Kawana F, Baba K, Kato T. Diagnostic accuracy of ambulatory polysomnography with electroencephalogram for detection of sleep bruxism-related masticatory muscle activity. J Clin Sleep Med 2023-02-01;19(2):379-392. doi:10.5664/jcsm.10344 · PMID 36305587 · PMCID PMC9892741 · cited by 8 (Europe PMC)
• Scarpini S, Lira AO, Gimenez T, Raggio DP, Chambrone L, Souza RC, Floriano I, Morimoto S, Tedesco TK. Associated factors and treatment options for sleep bruxism in children: an umbrella review. Braz Oral Res 2023-01-01;37():e006. doi:10.1590/1807-3107bor-2023.vol37.0006 · PMID 36629590 · cited by 7 (Europe PMC)
• Orzeszek S, Waliszewska-Prosol M, Ettlin D, Seweryn P, Straburzynski M, Martelletti P, Jenca A, Jenca A, Wieckiewicz M. Efficiency of occlusal splint therapy on orofacial muscle pain reduction: a systematic review. BMC Oral Health 2023-03-01;23(1):180. doi:10.1186/s12903-023-02897-0 · PMID 36978070 · PMCID PMC10053140 · open access · cited by 33 (Europe PMC)
• Manfredini D, Ahlberg J, Lavigne GJ, Svensson P, Lobbezoo F. Five years after the 2018 consensus definitions of sleep and awake bruxism: An explanatory note. J Oral Rehabil 2024-03-01;51(3):623-624. doi:10.1111/joor.13626 · PMID 37994212 · cited by 48 (Europe PMC)
• Ainoosah S, Farghal AE, Alzemei MS, Saini RS, Gurumurthy V, Quadri SA, Okshah A, Mosaddad SA, Heboyan A. Comparative analysis of different types of occlusal splints for the management of sleep bruxism: a systematic review. BMC Oral Health 2024-01-01;24(1):29. doi:10.1186/s12903-023-03782-6 · PMID 38182999 · PMCID PMC10770907 · open access · cited by 25 (Europe PMC)
• Zieliński G, Pająk A, Wójcicki M. Global Prevalence of Sleep Bruxism and Awake Bruxism in Pediatric and Adult Populations: A Systematic Review and Meta-Analysis. J Clin Med 2024-07-01;13(14):4259. doi:10.3390/jcm13144259 · PMID 39064299 · PMCID PMC11278015 · open access · cited by 112 (Europe PMC)
• Singh BP, Singh N, Jayaraman S, Kirubakaran R, Joseph S, Muthu MS, Jivnani H, Hua F. Occlusal interventions for managing temporomandibular disorders. Cochrane Database Syst Rev 2024-09-01;9():CD012850. doi:10.1002/14651858.cd012850.pub2 · PMID 39282765 · PMCID PMC11403706 · cited by 33 (Europe PMC)
• Yacoub S, Ons G, Khemiss M. Efficacy of botulinum toxin type A in bruxism management: A systematic review. Dent Med Probl 2025-01-01;62(1):145-160. doi:10.17219/dmp/186553 · PMID 40035138 · cited by 5 (Europe PMC)
• Verhoeff MC, Lobbezoo F, Ahlberg J, Bender S, Bracci A, Colonna A, Dal Fabbro C, Durham J, Glaros AG, Häggman-Henrikson B, Kato T, Koutris M, Lavigne GJ, Nykänen L, Raphael KG, Svensson P, Wieckiewicz M, Manfredini D. Updating the Bruxism Definitions: Report of an International Consensus Meeting. J Oral Rehabil 2025-09-01;52(9):1335-1342. doi:10.1111/joor.13985 · PMID 40312776 · PMCID PMC12408978 · open access · cited by 112 (Europe PMC)
• De Luca Canto G, Pauletto P, Stefani CM, Gonçalves TMSV, Junior NC, Flores-Mir C, Pinto ACPN, Trevisani VFM. Spin Bias in randomized controlled trials of botulinum toxin for bruxism management: a meta-epidemiologic study. BMC Med Res Methodol 2025-05-01;25(1):125. doi:10.1186/s12874-025-02547-9 · PMID 40340732 · PMCID PMC12060433 · open access
• Doblado NG, Barrera Mora JM, Dorado FP, Fernández JCR, Ordeix GB, Escalona EE. Relationship Between Bruxism and Obstructive Sleep Apnea: A Systematic Review of the Literature. J Clin Med 2025-07-01;14(14):5013. doi:10.3390/jcm14145013 · PMID 40725707 · PMCID PMC12295005 · open access · cited by 5 (Europe PMC)
• Taşdemir E, Doğan ŞE, Gülşen EA, Şeker Ç. Can Occlusal Splint or Botulinum Toxin A Therapy Reduce Masseter Muscle Thickness in Patients With Bruxism? J Oral Maxillofac Surg 2025-12-01;83(12):1453-1460. doi:10.1016/j.joms.2025.08.009 · PMID 40935351 · cited by 1 (Europe PMC)
• Gupta AK, Singh RK, Narula V. Centric stabilization occlusal splints vs. other conservative therapies in the management of temporomandibular disorders: a systematic review and meta-analysis. Saudi Dent J 2025-10-01;37(7-9):52. doi:10.1007/s44445-025-00052-9 · PMID 41091278 · PMCID PMC12528636 · open access · cited by 2 (Europe PMC)
• Aristizabal-Hoyos JA, López-Soto O, Fuentes-Barría H, Aguilera-Eguía R, Angarita-Davila L, Rojas-Gómez D. Sleep Bruxism and Occlusal Function: A Case-Control Study Based on Polysomnography in Young Colombians. J Clin Med 2025-09-01;14(19):6733. doi:10.3390/jcm14196733 · PMID 41095812 · PMCID PMC12524900 · open access · cited by 2 (Europe PMC)
• Foscaldo TF, Dos Santos Belo Junior PH, Ribeiro GR, de Proença LS, De la Torre Canales G, Senna PM. Comparing botulinum toxin and biofeedback therapies for awake bruxism: a randomized clinical trial. BMC Oral Health 2025-11-01;25(1):1772. doi:10.1186/s12903-025-07133-5 · PMID 41219710 · PMCID PMC12607165 · open access
• Sharaireh AM, Alkaabneh MM, Alsaket HE, Abdelhaleem HI, Hammad AI, Ismail NH, Alraheam IA, Aljamani S, Smadi L, Hassoneh Y, Al-Rabab’ah MA. Prevalence of Bruxism Among Young Adult Energy Drink Consumers in Jordan. J Clin Med 2025-12-01;15(1):203. doi:10.3390/jcm15010203 · PMID 41517452 · PMCID PMC12786534 · open access
• Graham DA, Lövgren A, Häggman-Henrikson B, Peck CC, Manfredini D, Saracutu OI. Management of awake bruxism: a systematic review. BMC Oral Health 2026-02-01;26(1):559. doi:10.1186/s12903-026-07856-z · PMID 41735990 · PMCID PMC13037066 · open access · cited by 2 (Europe PMC)
• Saini RS, Kaur K, Mosaddad SA, Heboyan A. Comparison of digital splints versus traditional splints for bruxism management: a systematic review. BDJ Open 2026-05-01;12(1):48. doi:10.1038/s41405-026-00438-9 · PMID 42103707 · PMCID PMC13156276 · open access
• Rabie R, ELkashlan M, Saleh S. Intestinal parasitic infections and their association with bruxism, tooth wear, and temporomandibular disorders in children in rural Egypt: a cross-sectional study. BMC Oral Health 2026-06-01;26(1):1023. doi:10.1186/s12903-026-08751-3 · PMID 42243845 · PMCID PMC13262464 · open access

Additional documents

• InsureKidsNow (CMS). Summary of Benefits Report for Utah, Medicaid — dental (data as of 04 Feb 2026) — TMJ treatment, including therapy and occlusal appliances (night guards), listed as non-covered; TMD fracture treatment covered; fluoride varnish up to 4x/calendar year; sealants 1x per 2 years per tooth; SDF every 6 months per tooth; orthodontics once per lifetime via the Utah IOTN sheet (PDF)

Bibliographic records above were retrieved and verified programmatically from Europe PMC (authors, journal, volume, pages, DOI, PMID, citation count). Coverage, guideline and regulatory statements are quoted from the cited public documents with their dates; verify against the current version before relying on them. This article is not medical or dental advice.