My jaw is locked — what should I do?

A locked jaw means your mouth is stuck and won't open or close the way it should. If this is happening right now, stay calm — many cases are associated with a muscle spasm or joint problem, and some people find relief with conservative self-care measures. 

What you'll learn in this article: 

• Most locked jaws are caused by a muscle spasm or TMJ problem. Warmth, gentle movement and rest are commonly recommended self-care measures. 

• A jaw that won't open (closed lock) is more common than one that won't close (open lock), and you should never force either one. 

• Jaw locking that happens repeatedly, especially with clicking, morning stiffness or facial tenderness, may be a sign of TMJ disorder or teeth grinding. 

• Get emergency care if jaw locking follows an injury or happens with fever, trouble breathing or trouble swallowing. 

If your jaw is locking regularly or won't release with home care, an Aspen Dental provider can evaluate what's driving it and recommend the right next step. 

What should I do if my jaw is locked right now? 

If your jaw is currently locked, take these steps in order: 

1. Stay calm: Anxiety causes muscles to tighten further. Slow your breathing and consciously relax your face, neck and shoulders. 

2. Apply warmth: Fold a damp warm towel or use a heating pad against the affected side of your face for 15–20 minutes. Some people find a warm, damp towel comfortable for jaw muscle tension. 

3. Gently massage the area: Using your fingertips, apply soft circular pressure to the muscles just in front of your ears and along your jawline. Keep pressure light. 

4. Try slow, careful movement: After warming the area, gently attempt small side-to-side jaw movements. Don't push. If there's resistance, stop. 

5. Do not force the jaw open: Forcing a locked jaw can injure the joint, damage the cartilage disc or tear surrounding tissue. 

6. Avoid hard, chewy or sticky foods: While your jaw is recovering, skip gum, tough meats and sticky foods that force your jaw to work harder than it needs to. 

7. Minimize wide yawning: Try to gently support your chin with your hand when you feel a yawn coming on. Opening too wide while the joint is irritated can reset the problem. 

If ibuprofen or another anti-inflammatory is safe for you to take, speak with your healthcare provider about whether it may be appropriate for your situation. 

When should I go to the emergency room for a locked jaw? 

Most jaw locking is not a medical emergency. But certain symptoms require immediate attention. 

Call 911 or go to the emergency room if you have: 

• Jaw stiffness spreading to your neck, back or abdomen 

• High fever alongside jaw tightness 

• Difficulty breathing or swallowing 

• A recent untreated wound that preceded the jaw stiffness 

• A locked jaw after a direct blow, fall or physical impact to the face or head 

These signs can indicate tetanus — a bacterial infection that causes muscle spasms beginning in the jaw and spreading throughout the body. According to the Cleveland Clinic, tetanus-related muscle stiffness is distinct from TMJ-related locking and is a medical emergency requiring immediate treatment.¹ If you're unsure, seek care promptly. 

Why does a jaw lock? 

On each side of your face, your jawbone connects to your skull through a small hinge called the temporomandibular joint (TMJ). A thin disc of cartilage inside that joint helps cushion every movement — chewing, speaking, yawning. When that disc slips out of position or the surrounding muscles seize up, your jaw can get stuck. 

What are the two types of jaw locking? 

• Closed lock: Your mouth is stuck and won't open fully. This is the most common type and what most people experience. 

• Open lock (dislocation): Your jaw drops open and won't close. This is less common and almost always requires a provider to reposition the joint safely — attempting to force it closed yourself risks injuring the surrounding tissue. Both involve a problem with how the joint disc or the muscles around it are working. 

What causes a locked jaw? 

Common causes include: 

• TMJ disorder (TMD): Dysfunction of the jaw joint — the most frequent driver of locking. 

• Muscle spasms: Sudden tightening of the chewing muscles, often triggered by stress or clenching. 

• Teeth grinding or clenching (bruxism): Often happens during sleep, straining the joint over time. 

• Injury or trauma: A blow to the jaw can shift the joint disc out of alignment. 

• Dental procedures or oral surgery: Some patients experience temporary jaw tightening after wisdom tooth extraction or other oral surgeries, as surrounding muscles can go into protective spasm. Recovery time can vary, and persistent symptoms should be evaluated by a healthcare provider. 

• Arthritis: Inflammation from osteoarthritis or rheumatoid arthritis affecting the joint. 

• Infection: In rare cases, a dental or throat infection can cause surrounding muscle stiffness. 

• Tetanus: A serious but rare bacterial infection that causes severe jaw stiffness — discussed below. 

If your jaw locks most often in the morning right after waking, bruxism (grinding or clenching during sleep) is frequently the underlying driver. 

When to see your dental provider 

You don't need the emergency room for typical jaw locking, but you should see a provider if: 

• Your jaw won't release after trying the steps above 

• Locking happens regularly, particularly in the mornings 

• You hear clicking, popping or grinding when you move your jaw 

• You have ear aching, headaches or facial tenderness alongside the locking 

• Your teeth don't feel like they fit together the way they used to 

These are signs of TMJ disorder, a common condition affecting the jaw joint and surrounding muscles. The National Institutes of Health estimates that TMD affects 5–10% of the population at some point.²

Your local dental provider can evaluate your jaw and discuss potential treatment options based on your individual needs.

My jaw is locked. What should I do? FAQs 

Why does my jaw keep locking over and over? 

Recurring jaw locking may be associated with an underlying condition: most commonly TMJ disorder, bruxism or chronic muscle tension from stress. A single episode might resolve on its own, but a pattern of repeated locking means the root cause hasn't been addressed. Ongoing episodes should be evaluated by a healthcare provider, particularly if symptoms persist or recur. 

Can stress lock your jaw? 

Yes — stress is a significant trigger. Many people clench their jaw or grind their teeth under stress without realizing it, especially during sleep. Over time, this creates chronic tightening in the jaw muscles and wears on the joint. For some people, stress management strategies may be discussed as part of an overall approach to recurring jaw tension. 

How long does a locked jaw usually last? 

The duration of a jaw-locking episode can vary depending on the underlying cause. Locking caused by a displaced joint disc tends to linger longer and may not fully release without professional treatment. If your jaw doesn't release within a few hours or continues to lock repeatedly, that's a sign to get it evaluated. 

Can I unlock my jaw at home, or do I need professional help? 

For a closed lock — when your mouth is stuck and won't open — warmth and careful movement are commonly suggested self-care measures while monitoring symptoms. Open lock, where your jaw drops open and won't close, almost always requires a provider to correct safely. Forcing either type can injure the joint further. If the lock hasn't eased within a few hours of careful home care, that's the signal to get it evaluated.

What's the difference between TMJ lockjaw and tetanus lockjaw? 

TMJ-related locking affects only the jaw joint and is caused by a structural or muscular problem. Tetanus (historically, called "lockjaw") begins with jaw stiffness but causes spasms that spread across the entire body, along with fever and sometimes difficulty breathing. TMJ locking is far more common. When in doubt about which you're experiencing, seek care immediately. 

Sources 

¹ Cleveland Clinic. Trismus. https://my.clevelandclinic.org/health/diseases/24086-trismus 

² National Institute of Dental and Craniofacial Research. Temporomandibular Disorders (TMD). https://www.nidcr.nih.gov/health-info/tmd