Teeth Grinding Is a Sign, Not a Diagnosis: What Bruxism May Be Telling You About Your Airway

Many people first learn they may be grinding their teeth when a dentist notices worn tooth surfaces, a fractured restoration, or other signs of heavy loading and mentions bruxism.

A nightguard may then be recommended to protect the teeth.

That can be appropriate. But there is another question worth asking:

What evidence do we actually have that you are grinding now, and is there anything else worth investigating?

Those questions matter because modern bruxism research has moved away from treating grinding as a single dental disorder with a single cause.

Bruxism is a behavior, not automatically a disorder

International consensus distinguishes between awake bruxism and sleep bruxism.

The 2018 international consensus defined awake bruxism as repetitive or sustained masticatory muscle activity during wakefulness, including tooth contact and jaw bracing or thrusting. Sleep bruxism was defined as masticatory muscle activity during sleep that may be rhythmic or non-rhythmic. [1]

An updated international consensus published in 2025 made several changes. One was explicit: the phrase "in otherwise healthy individuals" was removed from the definitions of both awake and sleep bruxism. The authors also continued to frame bruxism as a motor behavior rather than automatically as a disorder. [2]

That distinction matters.

Bruxism can have consequences that require treatment, such as damage to teeth or restorations. But observing those consequences does not automatically explain why the muscle activity is occurring.

How certain are we that you actually grind during sleep?

This is one of the most useful changes in the 2025 consensus.

Older bruxism literature commonly used a hierarchy of "possible," "probable," and "definite" bruxism. The updated consensus revised that approach and instead proposed terminology based on the method used to assess the behavior:

• Subject-based assessment, such as what you or a sleep partner reports
• Clinically based assessment, such as findings during a dental examination
• Device-based assessment, such as electromyography or polysomnography

These are not simply three levels of certainty about the same measurement. They provide different types of information. [2]

A patient may report waking with jaw soreness.

A dentist may see substantial tooth wear.

A recording device may measure repetitive jaw-muscle activity during sleep.

Those observations are related, but they are not interchangeable.

That becomes especially important when interpreting worn teeth.

Sleep bruxism is closely connected with brief changes in sleep

One of the better-established findings in sleep-bruxism research is its relationship with brief sleep arousals.

A common pattern of activity is called rhythmic masticatory muscle activity, or RMMA.

In laboratory studies, many RMMA episodes occur around brief changes in autonomic and brain activity.

Kato and colleagues found that RMMA episodes were commonly preceded by a sequence that included increased sympathetic cardiac activity and cortical activation. [3]

The same research group later tested the relationship experimentally. When brief sleep arousals were induced using sensory stimulation, the probability of subsequent RMMA increased. [4]

This does not mean every sleep-bruxism episode is caused by an arousal.

It does mean that sleep bruxism cannot be adequately explained simply by how the upper and lower teeth fit together. Sleep-related central and autonomic physiology is an important part of the picture.

Does sleep apnea cause teeth grinding?

This is where the evidence becomes much less certain.

Obstructive sleep apnea, or OSA, causes recurrent episodes of partial or complete upper-airway obstruction during sleep. Respiratory events can be accompanied or followed by brief arousals.

Sleep bruxism is also associated with arousal physiology.

That overlap has led researchers to investigate whether respiratory disturbances trigger jaw-muscle activity, whether jaw-muscle activity influences the airway, or whether both phenomena sometimes occur around the same arousal without one directly causing the other.

When the studies are combined, there is no clear overall association

A 2024 systematic review and meta-analysis screened 2,260 records and included 14 studies examining sleep bruxism and OSA. [5]

The pooled analysis found no statistically significant difference in the odds of sleep bruxism between people with OSA and controls:

OR 1.23, 95% CI 0.47 to 3.20.

The null result also persisted when OSA was divided by severity:

• Mild OSA: OR 1.56, 95% CI 0.76 to 3.18
• Moderate OSA: OR 1.51, 95% CI 0.77 to 2.94
• Severe OSA: OR 1.50, 95% CI 0.68 to 3.29

The analysis also found no significant increase in bruxism as OSA severity increased. In other words, there was no convincing dose-response pattern in which more severe OSA consistently meant more bruxism. [5]

The authors cautioned that the quality of the major included studies was low.

A separate 2025 systematic review interpreted the literature as suggestive of a relationship between OSA and bruxism, but rated the certainty of evidence as low. [6]

The defensible conclusion is therefore:

Current evidence does not establish that OSA causes sleep bruxism, nor that grinding is a reliable marker of OSA.

Could grinding actually help the airway?

This is an appealing theory, but the evidence conflicts.

One proposed explanation is that jaw-muscle activity following a respiratory disturbance might contribute to restoration of airflow.

Some studies have produced findings compatible with that idea. Others have not.

One case-control study found fewer bruxism episodes in people with OSA

Cid-Verdejo and colleagues conducted a polysomnographic case-control study involving 37 participants. [7]

They reported an inverse association between sleep bruxism and OSA, with an odds ratio of 0.15, 95% CI 0.036 to 0.68.

Participants with OSA had fewer average bruxism episodes than participants without OSA, 6.8 versus 25.08 episodes per night. Bruxism episodes also correlated negatively with both the apnea-hypopnea index and the number of hypopneas.

The authors suggested that sleep bruxism might have a protective role, while noting that the finding needed confirmation in larger studies. [7]

This is interesting evidence, but it comes from a small observational study. It does not establish that bruxism protects the airway.

A larger OSA study produced a different pattern

Przegrałek and colleagues examined polysomnography from 241 people with mild or moderate OSA. [8]

The paper is titled Sleep Bruxism as a Protective Factor in the Mild and Moderate Obstructive Sleep Apnea, but the title reflects the hypothesis being tested. The results did not establish sleep bruxism as a protective factor.

Using a bruxism episode index threshold of at least 2 events per hour, 175 participants were classified as having sleep bruxism and 66 were not.

Participants with bruxism had a mean hypopnea duration of 25.88 seconds versus 23.28 seconds, a difference of 2.60 seconds. Combined apnea and hypopnea duration was 24.04 versus 21.97 seconds, a difference of 2.07 seconds.

Both differences were statistically significant but small in absolute terms, and the study did not establish their clinical significance. [8]

Other respiratory measures moved in the opposite direction. The oxygen desaturation index was lower in one bruxism group, and participants with higher bruxism activity spent a smaller proportion of sleep time snoring.

So the results were not simply "bruxism makes breathing worse."

They showed that different respiratory measures can move in different directions.

The authors concluded that their findings did not support the specific hypothesis that bruxism generally shortens apnea or hypopnea events, while leaving open the possibility that any airway effect may depend on the type or severity of obstruction. [8]

Primary snoring adds another piece, but again not a simple answer

A separate polysomnographic study examined 224 adults with primary snoring, meaning snoring without OSA. [9]

Using a bruxism episode index threshold of at least 2 events per hour, 156 participants were classified in the higher-bruxism group and 68 in the lower-bruxism group. At a threshold of at least 4 events per hour, there were 99 and 125 participants respectively.

Some unadjusted comparisons suggested differences in snoring behavior.

The number of snore trains per hour of sleep was lower in participants with a BEI of at least 2 than in those below that threshold, 1.99 versus 3.53, with P = .0362. [9]

But that finding needs context.

Snore-train duration did not differ between the groups.

More importantly, when the investigators adjusted the main snoring outcomes for age, sex, BMI, and total sleep time, neither the BEI at least 2 nor the BEI at least 4 classification had a statistically significant effect on any of the main snoring outcomes, with all P values greater than .29. [9]

The study population also limits how broadly its findings can be applied. The 224 participants had a mean age of 35.38 years, and 77.6 percent were women. The analysis was retrospective and based on a single polysomnographic night without an adaptation night.

Those limitations are particularly relevant when applying the findings to older adults.

The authors' conclusion was appropriately cautious: sleep bruxism may be associated with changes in upper-airway behavior, but those changes are not necessarily protective, and the observational data cannot determine the causal nature or direction of the relationship. [9]

That is a useful summary of the broader evidence too.

Grinding should not currently be described either as a proven consequence of airway obstruction or as an established mechanism for protecting the airway.

So should someone who grinds be screened for sleep apnea?

Grinding by itself is not a validated OSA screening test.

But if evidence of bruxism appears alongside independent symptoms or risk factors for sleep apnea, discussing those symptoms with a clinician is reasonable.

Examples include habitual loud snoring, witnessed pauses in breathing, waking with gasping or choking, and substantial daytime sleepiness.

STOP-Bang is one commonly used risk-screening approach. The original STOP questionnaire was validated against polysomnography, and adding body mass index, age, neck circumference, and sex increased sensitivity for moderate and severe OSA in the original validation population. [10]

A questionnaire estimates risk.

It does not diagnose sleep apnea, and tooth grinding does not substitute for appropriate sleep assessment.

Medications can also be relevant

Some antidepressants have been associated with bruxism.

A 2015 study involved 807 participants, with 506 taking antidepressants and 301 serving as controls. [11]

Reported bruxism prevalence was 24.3 percent among antidepressant users compared with 15.3 percent among controls. The authors calculated an incidence of antidepressant-induced bruxism of 14.0 percent in their study population, with paroxetine, venlafaxine, and duloxetine among the drugs most strongly associated. [11]

There is an important limitation.

Sleep bruxism was identified from participant reports using diagnostic criteria in use at the time rather than from device-based measurement.

The figures therefore should not be interpreted as the incidence of polysomnographically confirmed sleep bruxism.

A much larger pharmacovigilance analysis provides separate evidence of an association. Researchers examined more than 14 million adverse-event reports in the World Health Organization's VigiBase database and found disproportionate reporting of bruxism with antidepressant exposure. [12]

Pharmacovigilance data cannot establish incidence and cannot prove causation.

But together, the evidence makes medication history relevant.

If significant grinding, clenching, or jaw symptoms begin after starting an antidepressant or changing its dose, discuss the timing with the prescriber.

Do not stop or change a prescription on your own.

Reflux has more evidence behind it than you might expect

Gastroesophageal reflux has also been investigated in relation to sleep bruxism.

The evidence is still based on small studies, but it goes beyond a simple observational association.

Acid suppression reduced jaw-muscle activity in an early controlled study

Miyawaki and colleagues studied 10 patients with nocturnal bruxism and 10 matched controls. Participants were matched for height, weight, age, and sex, and none reported symptoms of gastroesophageal reflux disease.

Portable esophageal pH monitoring, electromyography, and audio-video recordings were conducted overnight in the participants' homes.

The bruxism group had more RMMA activity and more nocturnal episodes of reduced esophageal pH than the controls. The investigators also conducted a double-blind, placebo-controlled clinical component using a proton pump inhibitor.

After PPI administration, RMMA frequency was significantly lower than after placebo in both groups. Among controls, RMMA frequency was 1.0 versus 1.9 episodes per hour. Among participants with bruxism, it was 3.7 versus 6.0 episodes per hour. [13]

The fact that these participants did not report clinical GERD symptoms is important.

It makes the finding interesting mechanistically, because measurable nocturnal acid exposure and a response to acid suppression occurred without symptomatic reflux disease. But it also means the results cannot simply be extrapolated to say that treating symptomatic GERD will treat sleep bruxism.

Researchers then tested acid exposure directly

A 2011 randomized, single-blind crossover experiment tested the relationship more directly.

Twelve healthy adult men without sleep bruxism underwent polysomnography while researchers infused either a small quantity of acidic solution or saline into the esophagus.

In the 20 minutes following acid infusion, frequencies of electromyographic bursts, RMMA episodes, grinding noise, and the ratio of RMMA to microarousals were significantly higher than after saline infusion. [14]

This is stronger evidence for a physiological link because the exposure was experimentally manipulated.

But it is still a small laboratory experiment in healthy men without diagnosed sleep bruxism. It does not establish that gastroesophageal reflux is the cause of sleep bruxism in patients generally.

A second placebo-controlled PPI trial also reduced bruxism activity

In 2016, Ohmure and colleagues studied 12 patients with polysomnography-confirmed sleep bruxism in a randomized, double-blind, placebo-controlled crossover trial.

Participants received rabeprazole or placebo. Proton-pump inhibitor treatment significantly reduced the frequency of EMG bursts, RMMA episodes, and grinding noise. [15]

There is an important detail here too.

On gastrointestinal evaluation, 41.7 percent of participants met the study's criteria for GERD and six had mild reflux esophagitis, meaning the group was not simply a cohort of patients presenting with symptomatic reflux.

The investigators explicitly cautioned that clinical use of PPIs as a treatment for sleep bruxism should remain on hold and called for larger studies.

That remains the appropriate conclusion.

Taken together, these three studies provide evidence for a physiological relationship between esophageal acid exposure and sleep-related masticatory activity.

They do not establish that reflux is the general cause of sleep bruxism, and they do not justify prescribing acid-suppressing medication simply to treat grinding.

What can a dentist actually tell from your teeth?

A dentist may see findings compatible with bruxism, including worn tooth surfaces, fractured teeth, damaged restorations, or enlarged or tender jaw muscles.

But clinical findings and active sleep bruxism are not the same thing.

The 2025 consensus makes this distinction particularly useful. A clinical examination can identify findings that may be associated with bruxism, while device-based assessment measures aspects of the behavior itself. [2]

Tooth wear is the clearest example of why this matters.

Wear accumulates over time. It may reflect behavior that was more active years earlier, and it can have multiple causes.

A study of young adults found that tooth wear could help distinguish groups of reported sleep bruxers from controls but could not reliably identify people with higher frequencies of sleep-bruxism muscle activity. [16]

A later study compared tooth wear with home masseter-muscle recording in 41 healthy adults and found no significant correlation between sleep-time muscle activity and tooth wear. [17]

The distinction is simple:

Tooth wear tells you that tooth structure has been lost. It does not reliably tell you how much you are grinding tonight.

Sleep bruxism can generate substantial force

The forces involved can be substantial.

Nishigawa and colleagues measured nocturnal bite force in 10 participants over three nights each, following a one-week period in which participants became familiar with the measurement appliances. [18]

Across the resulting 30 home recordings, 499 bruxism events met the study criteria.

The mean amplitude of the detected bruxism events was 22.5 kgf, with a mean duration of 7.1 seconds.

For each participant, the mean of the highest nocturnal bite forces was 42.3 kgf, compared with a mean maximum voluntary daytime bite force of 79.0 kgf.

The mean ratio of nocturnal maximum force to maximum voluntary daytime force was 53.1 percent.

There was substantial variation between individuals. The ratio ranged from 17.3 to 111.6 percent, meaning that in at least one participant the strongest recorded nocturnal bite force exceeded that person's measured maximum voluntary daytime force. [18]

So it is inaccurate to say that people routinely bite harder asleep than they possibly can while awake.

A more accurate conclusion is:

Sleep-bruxism events can generate substantial forces, but nocturnal maximum forces in this small study averaged roughly half of maximum voluntary daytime force. An individual event may occasionally approach or exceed a person's measured daytime maximum.

What a nightguard does, and what it does not do

An occlusal splint can be useful for protecting vulnerable teeth and restorations.

It places a physical appliance between opposing teeth and changes how contacts and forces are distributed.

But protecting the teeth is not the same as eliminating bruxism.

In a randomized controlled study, patients with sleep bruxism received either a stabilization splint or a palatal control appliance. At the group level, the stabilization splint did not produce a significant reduction in the principal polysomnographic measures of sleep bruxism after four weeks. Individual responses varied. [19]

A nightguard therefore should not automatically be described as something that stops grinding.

Its purpose may instead be to protect vulnerable structures while the underlying muscle activity continues.

There is an important caveat if you have sleep apnea

A conventional stabilization splint is not a treatment for OSA.

Small clinical studies also suggest that this type of appliance can worsen respiratory measurements in some people who already have sleep apnea.

A 2004 pilot study examined 10 patients with OSA. [20]

Individual responses varied considerably.

Five of the ten participants experienced an AHI increase greater than 50 percent while using the splint.

This was a very small, open pilot study, so it should not be used to estimate how commonly a conventional splint worsens OSA. It does, however, provide evidence that respiratory responses to an occlusal splint can differ substantially between individuals.

A later randomized crossover study provides stronger, although still small-scale, evidence.

Ten patients with OSA underwent three polysomnographic recordings with a maxillary stabilization splint and three without it. [21]

Mean AHI was 17.4 events per hour with the splint versus 15.9 without it, with P = .025.

The mean increase in AHI was 1.4 events per hour, with a 95 percent confidence interval from -1.9 to 4.7.

The researchers concluded that the splint was associated with a risk of aggravating OSA, while also emphasizing that the effect size was small and therefore reduced the clinical relevance of the finding. [21]

A statistically significant result does not necessarily mean the average clinical effect is large.

These studies do not establish that conventional nightguards are unsafe for everyone with OSA.

They support a narrower conclusion:

Known or strongly suspected sleep apnea is relevant information when an overnight dental appliance is selected and monitored.

A mandibular advancement appliance is a different device

A conventional stabilization splint and a mandibular advancement appliance are not interchangeable.

A stabilization splint is generally used to manage dental or musculoskeletal consequences.

A mandibular advancement appliance holds the lower jaw forward and can be used to treat appropriately selected patients with OSA.

Researchers have investigated whether effective mandibular advancement also changes sleep-related jaw-muscle activity.

Aarab and colleagues studied 18 patients with OSA and found that effective mandibular advancement appliance therapy significantly reduced jaw-closing muscle activity temporally related to respiratory arousals. [22]

That does not establish mandibular advancement as a general treatment for sleep bruxism.

Importantly, the investigators themselves concluded that future studies are needed to confirm the finding in patients who have both OSA and comorbid sleep bruxism.

It means that someone with diagnosed OSA and substantial tooth-loading concerns may require a different appliance discussion from someone whose primary objective is simply protecting worn teeth.

What should you ask if your dentist says you grind?

The first useful question is:

What evidence do we actually have?

Is the conclusion based on what you or your partner reports, findings during a dental examination, or a device that measured muscle activity?

Those forms of evidence tell us different things.

The second question is:

Do I have independent symptoms or risk factors for sleep apnea?

Grinding alone does not diagnose OSA. Grinding alongside habitual snoring, witnessed breathing pauses, gasping, or substantial daytime sleepiness deserves a different conversation.

The third is:

Did this begin around the time of a medication change?

Antidepressant-associated bruxism is sufficiently documented to make the medication history relevant. That should lead to a conversation with the prescriber, not an unsupervised medication change.

Another question is:

Do I have independent reasons to suspect reflux?

The experimental evidence makes reflux biologically relevant to sleep bruxism, but the studies are too small to justify assuming that reflux is the cause of someone's grinding or treating bruxism with acid suppression without a separate medical indication.

And finally:

What exactly is the nightguard intended to accomplish?

If the goal is to protect vulnerable teeth and restorations, an occlusal splint may be appropriate.

If the claim is that wearing it will eliminate the underlying sleep-bruxism activity, the evidence is much less convincing.

The bottom line

Sleep bruxism is best understood as a motor behavior, not automatically as a disease.

Many sleep-bruxism events occur in close relationship with brief changes in autonomic and cortical activity during sleep. What drives that behavior in a particular person is much harder to establish.

The relationship with obstructive sleep apnea remains unsettled.

A 2024 meta-analysis found no statistically significant overall association between OSA and sleep bruxism and no clear relationship with OSA severity. [5]

Individual polysomnographic studies point in different directions.

Cid-Verdejo and colleagues found fewer bruxism episodes in people with OSA and proposed a possible protective relationship. [7]

Przegrałek and colleagues found that participants with sleep bruxism had slightly longer respiratory events on some measures, while also showing some more favorable oxygenation and snoring measures. [8]

A separate primary-snoring study found an unadjusted reduction in snore trains per hour among one bruxism group, but the main snoring outcomes were no longer significantly associated with bruxism after adjustment for age, sex, BMI, and total sleep time. Snore-train duration was not shortened by bruxism. [9]

The conflict in the airway evidence is itself the important finding.

Current research does not support telling patients that grinding is caused by airway obstruction.

It also does not support telling them that grinding reliably protects the airway.

The reflux literature is somewhat different. Two small placebo-controlled studies found reduced RMMA or related bruxism activity during proton-pump inhibitor treatment, and a randomized laboratory experiment found that esophageal acidification increased RMMA and grinding-related activity. [13-15]

That provides evidence of a physiological connection, but it still does not establish reflux as a universal cause of sleep bruxism or PPIs as a routine bruxism treatment.

Antidepressant exposure also has a documented association with bruxism. Tooth wear can record accumulated structural damage but cannot reliably measure current nighttime muscle activity.

And a nightguard can protect teeth without necessarily stopping the behavior that made the protection necessary.

So if your dentist tells you that you grind your teeth, protecting the teeth may be one part of the conversation.

The other part is understanding what evidence you actually have, what it can tell you, and what it cannot.

References

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