Causes of cracking jaw

Overview

A cracking jaw is a sound, like a click or pop, that comes from the jaw joint when you open or close your mouth. This joint is called the temporomandibular joint (TMJ), and the noise is often harmless.

Yes, many people experience jaw cracking at some point in their lives. It is especially common in young adults and people who clench or grind their teeth.

Jaw cracking can affect people of all ages, but it is most common in people aged 20 to 40. It also affects women more often than men.

Symptoms

Common symptoms

• A clicking or popping sound when opening or closing the mouth.
• A grating feeling when moving the jaw.
• Mild discomfort or a feeling of tightness around the jaw.

Symptoms in children

• Clicking sounds that may be noticed when a child chews or yawns.
• Sometimes children grind their teeth at night, which can cause jaw sounds.
• Thumb-sucking or nail-biting can also lead to jaw symptoms.

Symptoms in older adults

• Cracking may be related to wear and tear in the jaw joint, similar to arthritis in other joints.
• Some older adults experience pain or stiffness along with the noise.
• Changes in teeth or dentures can affect how the jaw works.

Causes

Main causes

• Temporomandibular joint (TMJ) disorder – a problem with the joint that connects your jaw to your skull.
• Muscle tension in the jaw, often from stress or clenching your teeth.
• Arthritis in the jaw joint, such as osteoarthritis or rheumatoid arthritis.
• Injury to the jaw, face, or neck.
• Bruxism – grinding or clenching your teeth, especially during sleep.

Risk factors

• High levels of stress or anxiety.
• Poor posture, especially when sitting at a computer or looking at a phone.
• Habits like chewing gum, biting nails, or biting the inside of your cheek.
• Having a job or hobby that involves lots of jaw movement (like singing or public speaking).
• Having arthritis in other joints.

When to see a doctor

See a doctor urgently if:

• Your jaw is locked and you cannot open or close your mouth.
• You have severe pain that does not go away with simple self-care.
• You have signs of infection – swelling, redness, warmth, or fever.

Book a routine appointment if:

• The cracking sound is accompanied by pain that lasts more than a few days.
• You have trouble chewing or opening your mouth comfortably.
• You notice that your jaw clicks every time you move it and it bothers you.

Diagnosis

Your doctor or dentist will ask about your symptoms, examine your jaw joint, and check how your teeth fit together. They will also feel for tenderness and listen for sounds when you open and close your mouth.

Tests that may be done

• X-rays of the jaw and teeth to look for joint problems or arthritis.
• CT scan or MRI for a more detailed view of the joint and surrounding tissues.
• Sometimes a 3D imaging test is used if the cause is not clear.

What to expect at your appointment

Most of the time, no scans are needed. The doctor will start with a physical exam and ask about your habits and stress levels. They may also ask if you grind your teeth at night. Based on that, they can often give you advice without needing more tests.

Treatment

Treatment for a cracking jaw depends on the cause and how much it bothers you. In many cases, simple self-care and lifestyle changes are enough to relieve symptoms. If pain or discomfort continues, your doctor may suggest further treatments.

Self-care at home

• Eat soft foods that do not require a lot of chewing (like yoghurt, soups, scrambled eggs).
• Apply a warm compress or ice pack to the side of your jaw for 10 to 15 minutes.
• Practice gentle jaw exercises, such as opening and closing your mouth slowly, or moving your jaw side to side.
• Avoid chewing gum, biting your nails, or chewing on ice or pens.
• Try stress-reducing activities like deep breathing, meditation, or gentle stretching.

Medical treatments

If self-care is not enough, your doctor may recommend physiotherapy or exercises to strengthen and relax the jaw muscles. They might also suggest a custom-made mouth guard to wear at night if teeth grinding is a problem. In some cases, medications such as pain relievers, muscle relaxants, or anti-inflammatory drugs may be prescribed. (No specific drug names or doses are mentioned here.)

When is surgery considered?

Surgery for a cracking jaw is very rare. It is only considered for severe cases that do not improve with other treatments, or if there is a structural problem in the joint that needs repair. Most people never need surgery.

Living with this condition

Living with a cracking jaw is often manageable. If you have occasional pain or stiffness, you can plan your day to include rest periods for your jaw. Eating smaller, softer meals and avoiding hard or chewy foods can help.

Lifestyle tips

• Practice good posture, especially when using a computer or looking at your phone.
• Avoid habits that put extra pressure on your jaw, like chewing gum or grinding your teeth.
• Try to keep your jaw in a relaxed position with your lips together but teeth apart.

Diet and exercise

Eat a diet of soft, nutritious foods. Good choices include oatmeal, mashed potatoes, cooked vegetables, and smoothies. Avoid hard foods like nuts, raw carrots, and tough meat. For exercise, gentle jaw stretches and neck relaxation exercises can help keep the muscles loose.

Mental health and emotional wellbeing

Stress and anxiety can make jaw tension worse, leading to more cracking and pain. It is common to feel frustrated or worried about the sound. Remember that most cases are harmless, and finding ways to relax can improve both your mood and your jaw.

Prevention

You cannot always prevent a cracking jaw, but you can lower your risk by avoiding habits that strain the joint. This includes being mindful of teeth grinding, reducing stress, keeping good posture, and not chewing on hard objects.

Vaccines

There are no vaccines for jaw cracking or TMJ disorders.

Screening programmes

There is no routine screening for jaw problems. If you notice symptoms, you can see your dentist or GP for a check-up.

Complications

If left untreated

• Chronic pain around the jaw, face, or neck.
• Increased stiffness and difficulty opening the mouth fully.
• Development of a TMJ disorder that might require long-term management.

Long-term outlook

For most people, a cracking jaw is temporary or easily managed with simple steps. Even if it becomes a longer-term issue, treatments are available and effective. Many people find relief with self-care and do not need medical treatment. With the right approach, you can usually keep symptoms under control and continue your daily activities without major problems.

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