Teeth Grinding and Sleep Apnea: Why the Studies Disagree

I went looking for a clean answer to a simple question: if you grind your teeth at night, is sleep apnea the reason? The papers I read don’t agree with each other, and the disagreement is the interesting part.

Here is what each review actually counted, and where the evidence stops.

What Did the Scoping Review Count?

I started with a 2022 scoping review in Sleep. It pulled together 13 adult studies and 8 studies in children.

The median co-occurrence of sleep bruxism and sleep-disordered breathing was 39.3% in adults and 26.1% in children. Most adult studies found no significant association between the two.

Co-occurrence is not the same as cause. Two common conditions will overlap in many people by chance alone.

What Does the Meta-Analysis Say?

A 2024 meta-analysis in Sleep Medicine Reviews pooled 14 studies. The odds of sleep bruxism in people with obstructive sleep apnea, compared with controls, came out at 1.23.

The 95% confidence interval ran from 0.47 to 3.20, which includes no effect at all. The authors graded the evidence as low quality.

That is wide enough that I wouldn’t lean on either conclusion. It tells me the question hasn’t been answered, not that the answer is no.

Does Treating Apnea Change the Grinding?

A 2024 study in Sleep and Breathing reported that almost half of the people with obstructive sleep apnea also had sleep bruxism. It found that optimal pressure therapy significantly reduced grinding episodes.

I read that as a signal worth testing rather than a rule. It fits the idea that some grinding happens around breathing events, and it doesn’t say every grinder has apnea.

If you want the breathing side in more detail, my digest of what the research says about each cause of gasping covers the related ground.

What About Devices for Grinding?

A 2021 systematic review found insufficient evidence for splints compared with no treatment or other treatments. A Cochrane review of five trials found no significant difference on the one outcome it could pool.

A 2022 review in the Japanese Dental Science Review said oral appliances tended to reduce grinding events, and that the evidence for cognitive behavioral therapy was not well supported. It noted that several drugs and botulinum toxin reduced specific measurements but came with side effects.

I find that mixed picture honest. Devices are a reasonable way to protect teeth, and the proof that they change the habit is limited.

How Should You Use This?

If you grind and also snore loudly, I would not guess. A dentist can look at tooth wear, and a sleep test can check your breathing.

Our earlier piece on snoring and teeth grinding gives the plain-language overview. For measurement questions, see how overnight oximetry can mislead and what the studies say about morning dry mouth.

When Should You See a Dentist or Doctor?

See a dentist for chipped teeth, jaw locking, or morning facial pain. See a doctor if grinding comes with loud snoring, witnessed pauses, gasping, or heavy daytime sleepiness.

Your Next Step: Bring Better Questions to Your Appointments

Write down what you notice about your jaw, your snoring, and your daytime energy. Take that list to both your dentist and your doctor.