Jaw Clenching: Causes, Symptoms, and How to Protect Your Teeth

Many people clench their jaw without realizing it, during the day or while they sleep. Here’s what causes it, what it does to your teeth, and what helps.

By the FixUrSmile Dental Lab team · Updated September 2026

What Is Jaw Clenching?

Jaw clenching means tightly pressing your upper and lower teeth together. It’s part of bruxism, which also includes grinding your teeth side to side. It can happen while you’re awake (often during concentration or stress) or while you sleep, when you can’t control it.

Jaw clenching: custom night guard made in the FixUrSmile US dental lab

Common Signs and Symptoms

According to Mayo Clinic, signs of bruxism include:

Grinding or clenching that may be loud enough to wake a sleep partner
Worn, flattened, chipped, or sensitive teeth
Tired or tight jaw muscles, or a jaw that doesn’t open or close fully
Jaw, neck, or face pain, or soreness near the ear
A dull headache starting at the temples, especially in the morning

What Causes Jaw Clenching?

The exact cause isn’t fully understood. Mayo Clinic describes it as a mix of physical, mental health, and genetic factors. Commonly linked risk factors include:

Stress and anxiety
Caffeine, alcohol, and tobacco use
Certain medications, including some antidepressants
Sleep disorders such as sleep apnea
Family history (sleep bruxism often runs in families)

How Clenching Affects Your Teeth and Jaw

Over time, heavy clenching can wear down enamel, crack teeth or dental work, and strain the jaw joints and muscles. It’s also associated with tension-type headaches and TMJ symptoms.

How to Reduce Jaw Clenching

Mayo Clinic lists several approaches that may help, depending on the cause:

Splints and mouth guards keep the upper and lower teeth separated during sleep and protect teeth from wear.
Stress management such as exercise, meditation, or talking with a professional.
Awareness during the day: notice when you clench and relax your jaw: lips together, teeth apart.
Cutting back on caffeine and alcohol, especially in the evening.
Treating related conditions such as sleep apnea, and reviewing medications with your doctor.

Source: Mayo Clinic.

Does a Night Guard Help With Clenching?

A night guard doesn’t stop the urge to clench, but it puts a durable layer between your teeth so the force goes into the guard instead of your enamel. For heavy clenchers, a firmer or dual-layer guard usually lasts longer. Learn more in best night guard for teeth grinding and soft vs. hard night guards.

A FixUrSmile custom night guard is $297 per arch, made from impressions you take at home.

When to See a Dentist or Doctor

See a dentist or doctor if your teeth are worn, damaged, or sensitive; if you have jaw, face, or ear pain; if your jaw locks or won’t open fully; or if someone notices you snore, gasp, or stop breathing during sleep.

Frequently Asked Questions

Why do I clench my jaw at night?

Nighttime clenching is linked to brief sleep disturbances, stress, caffeine or alcohol, certain medications, and sleep disorders like sleep apnea. The exact cause varies from person to person.

How do I stop clenching my jaw?

Managing stress, limiting caffeine and alcohol, and practicing ‘lips together, teeth apart’ during the day can help. A night guard protects your teeth while you sleep.

Is jaw clenching serious?

Occasional clenching is common. Frequent, heavy clenching can damage teeth and strain the jaw, so it’s worth discussing with a dentist.

Can a night guard make clenching worse?

A well-fitting guard shouldn’t. If jaw pain increases or your bite feels different, stop wearing it and see your dentist.

This guide is for general information and isn’t a substitute for advice from your dentist. If you have pain, swelling, loose teeth, or other oral health concerns, please see a dental professional.

Protect Your Teeth at Night

Custom night guard made from your impressions, $297 per arch. Made in our US dental lab from impressions you take at home, with licensed dentist approval and our Custom Fit Guarantee.

Shop Now Read the FAQ