Teeth Grinding at Night (Bruxism): Causes, Damage, and How to Stop

Published February 28, 2026 · Updated May 21, 2026· 4 min read

Sleep bruxism — grinding or clenching your teeth at night — affects about 8-10% of adults and many more children. Most cases are mild. Some cause real damage: cracked teeth, receding gums, jaw pain, chronic headaches. Bruxism is also often linked to sleep apnea, which means treating it can mean treating something bigger.

TL;DR

Sleep bruxism affects ~8-10% of adults; awake bruxism is separate and affects ~20%.
Most people don't know they grind — partners or dentists usually notice first.
Strongly associated with stress, anxiety, and sleep apnea (treat the apnea, often the grinding improves).
Night guards prevent tooth damage but don't stop the grinding itself.
See a dentist if you have jaw pain, headaches on waking, or visible tooth wear.

What sleep bruxism actually is

Sleep bruxism is rhythmic jaw-muscle activity during sleep — either grinding teeth against each other or clenching them tight. It typically occurs in episodes during the transition between sleep stages, particularly between deep and light sleep. Most episodes are brief but the cumulative force can be substantial: bite force during sleep clenching can exceed bite force during conscious chewing.

Sleep bruxism is distinct from awake bruxism (daytime clenching, often stress-related), though many people have both. The treatments and triggers differ somewhat.

How you find out you're grinding

Most bruxers don't know it themselves. The signs are usually noticed by:

Your bed partner — they hear it, often described as a creaking or scraping sound
Your dentist — flat or worn tooth surfaces, chipped enamel, sensitive teeth, receding gums in specific patterns
Yourself, retrospectively — morning jaw soreness or stiffness, headaches that start at the temples, ear pain that isn't an ear infection

SnoreCam-style recording can also catch the audio of teeth grinding — the sound is distinctive and the timing pattern matches what dental researchers describe.

What causes it

The mechanism isn't fully understood, but several factors are well-established:

Stress and anxiety — the strongest modifiable factor for most adults. Periods of high stress predictably increase bruxism in people prone to it.
Sleep apnea. About 25% of sleep apnea patients have concurrent bruxism. The pattern often is: apneic event → brief arousal → jaw muscle activation. Treating the apnea often reduces the grinding.
Caffeine, alcohol, and nicotine — all increase bruxism frequency.
Certain medications — particularly SSRIs, which can cause or worsen bruxism in some patients. Worth flagging if you started grinding after starting an antidepressant.
Acid reflux (GERD) — nighttime acid exposure correlates with bruxism, possibly via brief arousals from the reflux itself.
Genetics. Bruxism runs in families.
Dental misalignment — older theory; current evidence suggests this is a smaller factor than once thought.

What damage it causes

Untreated bruxism can produce:

Tooth wear — flattened biting surfaces, exposed dentin, accelerated aging of the dentition
Cracked or chipped teeth — especially molars
Tooth sensitivity as enamel wears through
Receding gums and bone loss
Temporomandibular joint (TMJ) disorders — jaw pain, clicking, limited mouth opening
Chronic morning headaches, especially in the temples
Hypertrophy of the masseter muscles — visible jaw squaring over time

Treatment

Night guards (occlusal splints)

Custom-fitted dental night guards are the first-line treatment — they don't stop the grinding but they prevent the damage by absorbing the force. Custom guards from a dentist cost $200-700; over-the-counter "boil and bite" guards cost $20-40 and are a reasonable starting point if budget is tight, but wear out faster and fit less precisely.

Treat the underlying drivers

Stress management — CBT, exercise, meditation, or addressing the source of the stress. Modest but real reductions in bruxism frequency.
Sleep apnea treatment — if you snore loudly or have other OSA signs, get evaluated. Treating apnea often reduces bruxism substantially.
Reduce caffeine, especially in the afternoon and evening.
Limit alcohol and nicotine.
Treat acid reflux if present (dietary changes, head elevation, PPIs if indicated).

Other approaches

Botox injections to the masseters — increasingly used for severe bruxism. Reduces muscle force for 3-6 months per treatment. Off-label but with growing evidence base.
Biofeedback devices — wearable monitors that alert you when clenching occurs. Mixed evidence; most useful for daytime bruxism.
Medication changes — if your SSRI is the trigger, switching to a different class (with prescriber guidance) may help.

When to see a dentist or sleep doctor

Morning jaw pain or headaches on most days
Visible tooth wear or chipping
Partner hears nightly grinding
TMJ clicking, pain, or limited mouth opening
Snoring or other sleep apnea symptoms (which may be the underlying driver)

Catch the audio of your own grinding

Teeth grinding has a distinctive sound that SnoreCam's on-device microphone can capture. Hearing yourself grind is often the moment people take it seriously enough to talk to a dentist. Clips stay on your phone.

Learn about SnoreCam →

FAQ

How do I know if I grind my teeth at night?

Most bruxers don't know it themselves — a bed partner usually hears a creaking or scraping sound, or a dentist spots flat or worn tooth surfaces, chipped enamel, and receding gums. Retrospective clues include morning jaw soreness, headaches that start at the temples, and ear pain that isn't an ear infection. Recording the audio of your sleep can also catch the distinctive grinding sound.

What causes teeth grinding during sleep?

The mechanism isn't fully understood, but stress and anxiety are the strongest modifiable factors for most adults. Sleep apnea is a major driver — about 25% of apnea patients also grind, often via apneic event then arousal then jaw activation. Caffeine, alcohol, nicotine, certain SSRIs, acid reflux, and genetics all play a role.

Does a night guard stop teeth grinding?

No — a night guard doesn't stop the grinding, it prevents the damage by absorbing the force. Custom-fitted occlusal splints from a dentist ($200-700) are the first-line treatment; over-the-counter boil-and-bite guards ($20-40) are a reasonable start on a tight budget but wear out faster and fit less precisely. To reduce the grinding itself, you have to treat the underlying drivers.

Is teeth grinding connected to sleep apnea?

Often, yes. About 25% of sleep apnea patients have concurrent bruxism, and the pattern is frequently an apneic event followed by a brief arousal that activates the jaw muscles. Because of this link, treating the apnea often reduces the grinding substantially — so if you snore loudly or have other OSA signs, getting evaluated can address both problems.