Teeth Grinding (Bruxism): Why It Happens and How to Stop It

Teeth grinding (bruxism) can cause jaw pain, headaches, and damaged teeth. Learn why it happens at night and how to stop it for better sleep.

Sep 25 2026

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You might not know you grind your teeth at night until a dentist points out the damage or a partner mentions the sound. Teeth grinding, known medically as bruxism, is surprisingly common and often goes undetected for years. It can happen while you sleep or during the day, and the consequences go well beyond worn-down enamel.

Bruxism affects an estimated 8 to 13 percent of adults, though rates may be higher since many people are unaware they do it. For women in midlife, changes in stress, hormones, and sleep quality can make the problem worse or trigger it for the first time.

This article covers what bruxism is, what causes it, how it harms your health over time, and what you can do to stop it.

What Is Bruxism?

Bruxism is the involuntary clenching, grinding, or gnashing of teeth. It falls into two categories: awake bruxism, which typically involves clenching during the day, and sleep bruxism, which involves rhythmic grinding movements during the night. Sleep bruxism is classified as a sleep-related movement disorder.

According to a clinical overview of sleep bruxism published in the Journal of Clinical Sleep Medicine, sleep bruxism is characterized by repetitive jaw-muscle activity that produces grinding sounds and generates forces strong enough to damage teeth, restorations, and the temporomandibular joint over time.

Many people with sleep bruxism have no idea it is happening. The most common clues include waking up with a sore jaw, dull headaches centered around the temples, tooth sensitivity, and visible wear on the biting surfaces of the teeth. A bed partner may also report hearing grinding or clicking sounds during the night.

The two types differ in more than timing. Awake bruxism tends to involve sustained clenching without much side-to-side movement. Sleep bruxism produces rhythmic, repetitive grinding and is linked to micro-arousals during the night, brief moments where the brain shifts from deeper sleep to a lighter stage. This distinction matters because the triggers and treatments for each type can be different.

Why Does Bruxism Happen?

There is no single cause of bruxism. It results from a combination of factors that vary from person to person. Understanding the most common triggers can help you identify what may be driving it in your case.

Stress and Anxiety

Emotional stress is one of the strongest predictors of both awake and sleep bruxism. A large epidemiological study on risk factors for sleep bruxism found that people reporting high levels of daily stress, anxiety, and nervousness were significantly more likely to grind their teeth at night. The jaw muscles tense in response to psychological pressure, and during sleep that tension can escalate into full grinding episodes.

This connection is not limited to extreme stress. Even everyday tension from work, caregiving, or financial worries can keep the jaw muscles activated long after you fall asleep. People who tend to hold tension in their upper body, shoulders, or face are especially prone.

Sleep Disorders

Sleep bruxism frequently occurs alongside other sleep issues. A polysomnographic study involving over 1,300 adults found that sleep bruxism was highly prevalent in people with obstructive sleep apnea, with nearly half of apnea patients showing signs of grinding. Grinding episodes often occur at the end of apnea events, when the brain briefly rouses to reopen the airway. Snoring, restless sleep, and frequent nighttime awakenings are also associated with higher rates of bruxism.

Lifestyle Factors

Caffeine, alcohol, and tobacco all increase the likelihood of sleep bruxism. Caffeine and nicotine are stimulants that activate the nervous system and make it harder for the jaw muscles to fully relax during sleep. Alcohol disrupts sleep architecture, leading to lighter and more fragmented sleep where grinding is more likely to occur.

The effect of these substances is dose-dependent. The more caffeine consumed, and the later in the day it is consumed, the greater the risk. Even moderate alcohol use in the evening can increase the number and intensity of grinding episodes during the second half of the night, when sleep is already lighter.

Medications and Substances

Certain medications, particularly selective serotonin reuptake inhibitors (SSRIs) and other antidepressants, have been linked to bruxism as a side effect. If you have noticed jaw clenching or grinding after starting a new medication, it is worth discussing with your prescribing provider.

Hormonal Changes

For women in perimenopause and menopause, hormonal fluctuations may contribute to bruxism. Declining estrogen and progesterone levels affect sleep quality, increase stress reactivity, and alter pain sensitivity, all of which can amplify grinding patterns that may have been mild or absent before.

Some women notice jaw clenching or grinding appearing for the first time in their 40s or 50s, even without a prior history. The combination of disrupted sleep, increased nighttime awakenings, and hormonal shifts creates conditions where bruxism is more likely to develop or worsen.

How Bruxism Harms Your Health

Occasional grinding may not cause lasting problems, but chronic bruxism puts significant strain on multiple systems. The damage builds gradually, and by the time most people notice symptoms, the effects are already well established.

Dental Damage

The grinding forces generated during sleep bruxism can be several times stronger than normal chewing. Over months and years, this wears down enamel, flattens the biting surfaces of teeth, cracks fillings, and loosens crowns. In severe cases, teeth can fracture or require extraction.

Because the damage accumulates slowly, many people do not realize the extent of it until a dentist flags the problem during a routine visit. By that point, significant enamel may already be lost. Enamel does not regenerate, so the damage is permanent unless repaired with dental work. The financial cost of crowns, veneers, and other restorations adds up quickly.

Jaw and Facial Pain

Bruxism is one of the leading contributors to temporomandibular joint disorder (TMJ or TMD). Constant clenching overworks the muscles around the jaw, leading to soreness, stiffness, clicking, and limited range of motion. Many people also experience referred pain in the temples, ears, and neck.

Headaches and Sleep Disruption

Morning headaches, particularly tension-type headaches radiating from the temples, are a hallmark sign of sleep bruxism. The repetitive muscle contractions during the night prevent the jaw from resting, and the resulting tension spreads to surrounding muscles. Grinding episodes also fragment sleep, reducing time spent in deep, restorative stages.

How to Stop Teeth Grinding

There is no single cure for bruxism, but a combination of protective measures, habit changes, and targeted treatments can significantly reduce grinding and prevent further damage.

1. Wear a Custom Night Guard

A custom-fitted occlusal splint, commonly called a night guard, is the most widely recommended first-line treatment. It creates a barrier between the upper and lower teeth, absorbing grinding forces and protecting enamel, crowns, and restorations. Custom guards made by a dentist fit better and last longer than over-the-counter options, which can shift teeth if they do not fit properly.

It is important to understand that a night guard does not stop you from grinding. It protects your teeth while you address the underlying causes. Some people need to wear a guard indefinitely, while others find they can reduce use as contributing factors like stress or sleep disorders are managed.

2. Address Stress and Tension

Because stress is a primary driver of bruxism, stress-reduction strategies can have a measurable effect on grinding frequency. Cognitive behavioral therapy, progressive muscle relaxation, and mindfulness meditation have all shown benefit. Even a simple evening wind-down routine that includes jaw relaxation exercises can help. Place the tip of your tongue between your front teeth before bed to train the jaw muscles to release tension.

3. Improve Your Sleep Habits

Better sleep quality often leads to less grinding. Keep a consistent sleep and wake schedule, reduce screen time before bed, and create a cool, dark sleep environment. A structured wind-down routine, like the D.R.E.A.M. Method™, can signal to your body and jaw that it is time to let go of the day’s tension.

4. Cut Back on Stimulants

Reducing caffeine intake, especially after noon, and limiting alcohol in the evening can lower the intensity and frequency of nighttime grinding. If you smoke, this is one more reason to consider quitting, as nicotine keeps the nervous system in a heightened state that makes muscle relaxation during sleep more difficult.

5. Practice Daytime Jaw Awareness

Many people who grind at night also clench during the day without realizing it. Set periodic reminders to check in with your jaw. Your teeth should be slightly apart when your mouth is closed, with your lips together and tongue resting gently on the roof of your mouth. Noticing and releasing daytime clenching helps retrain the muscles and reduces the carry-over into sleep.

When to Talk to a Doctor or Dentist

If you wake up with a sore jaw, morning headaches, or your dentist has noticed unusual wear on your teeth, bruxism is worth investigating. A dental exam can reveal the extent of any damage, and a sleep evaluation may be appropriate if grinding is accompanied by snoring, pauses in breathing, or persistent fatigue.

According to an international consensus statement on bruxism, a definitive diagnosis of sleep bruxism requires polysomnography with audio and video recording, though most clinicians begin with a clinical history and oral examination. In some cases, a home sleep study or an in-lab sleep test may be recommended to rule out sleep apnea or other contributing conditions.

For more severe cases, treatment options can include physical therapy for the jaw muscles, botulinum toxin injections to reduce clenching force, or adjustments to medications that may be contributing to the problem. Working with both a dentist and a sleep specialist provides the most comprehensive approach.

Protecting Your Teeth Starts With Understanding the Problem

Bruxism is common, underdiagnosed, and capable of causing real damage to your teeth, jaw, and sleep quality if left unchecked. The good news is that once you know it is happening, there are effective ways to manage it.

A night guard protects your teeth while you work on the underlying factors. Stress management, better sleep habits, reduced stimulant use, and daytime jaw awareness all help lower the frequency and intensity of grinding. And if the problem persists or you suspect a sleep disorder may be involved, a professional evaluation can point you toward the right treatment plan.

You do not have to live with the pain, the dental bills, or the poor sleep that chronic grinding causes. With the right combination of protection and habit changes, most people see meaningful improvement.

This article is for informational purposes only and does not replace professional medical advice. Always consult a qualified healthcare provider for guidance on your individual health needs.

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