TMJ jaw pain: causes and relief

Reviewed by Dr. Samar Fadavi, DDS

Short answer: TMJ jaw pain usually comes from tired, overworked jaw muscles or irritation in the jaw joint itself. Clenching, grinding, stress, injury and arthritis are common causes. Most cases improve with simple steps such as soft foods, warm compresses, gentle movement and a custom night guard. See a dentist if pain lasts, your jaw locks or you cannot open fully.

Why this guide

Jaw pain is a frequent reason people call our clinic on Danforth Avenue. Some describe a dull ache in the cheeks after a stressful week. Others hear a click when they yawn, or feel the jaw catch when they bite into a sandwich. A few wake up and cannot open their mouth fully. The temporomandibular joint, or TMJ, works every time you talk, chew, swallow and yawn, so when it hurts, you notice.

This guide explains how the jaw joint works, the common causes of pain, what you can safely try at home, and how a dentist assesses and treats jaw problems. It is general information, not a diagnosis. Jaw pain can also come from teeth, sinuses, ears or nerves, which is why an exam matters. You can read about our approach on our night guards and TMJ page.

How the jaw joint works

You have two jaw joints, one in front of each ear. Each joint connects the lower jaw to the skull. A small disc of cartilage sits between the bones and acts like a cushion. When you open wide, the jaw does not just hinge. It also slides forward, and the disc moves with it.

Strong muscles on each side close the jaw and move it from side to side. You can feel the largest one, the masseter, at the angle of the jaw when you clench. Another, the temporalis, fans out over the temple. When these muscles work too hard, they ache just like any other overused muscle.

Dentists often use the term TMD, short for temporomandibular disorders, to describe problems with the joint, the muscles or both. In everyday speech most people just call it TMJ.

Common symptoms

• Aching or tenderness in the jaw, cheeks or in front of the ears
• Pain when chewing, especially tough or chewy food
• Clicking, popping or grating sounds when opening or closing
• A jaw that catches, locks open or locks closed
• Difficulty opening the mouth wide
• Headaches at the temples
• Earache, fullness or ringing with no ear infection
• Neck and shoulder tension
• A bite that suddenly feels different

Clicking on its own, without pain or locking, is common and often needs no treatment. Pain, locking or a change in how the teeth meet deserves a visit.

Common causes of jaw pain

Clenching and grinding

Night grinding and daytime clenching are among the most frequent causes. The muscles work for hours without rest, and the joint carries heavy loads. Our guide do you grind your teeth at night? explains the signs and how to protect your teeth.

Stress

Stress often shows up as tight shoulders, a tense neck and a clenched jaw. Busy work weeks, exams, caregiving and money worries can all bring on flare-ups.

Disc displacement

If the cushioning disc slips out of its normal position, the jaw may click as it moves back into place. Sometimes the disc does not move back, and the jaw cannot open fully. This is often called a closed lock.

Arthritis

Osteoarthritis and inflammatory types of arthritis can affect the jaw joint, just as they affect knees and hands. This tends to cause grating sounds and stiffness, often in older adults.

Injury

A blow to the face, a fall, a sports injury or a car accident can bruise or strain the joint. Very long dental visits with the mouth open wide can also leave the jaw tired for a day or two.

Bite and tooth problems

A high filling, a new crown or missing back teeth can change how the jaw closes. The bite is rarely the only cause of TMJ pain, but it is worth checking. Bite patterns like a deep overbite or crossbite are explained in our guide on overbite and underbite.

Posture and habits

Long hours looking down at a phone or leaning toward a screen, chewing gum all day, biting nails or pens, and resting the chin on a hand can all strain the jaw.

Other causes to rule out

Pain near the jaw is not always the jaw joint. A dentist and, when needed, a doctor will consider:

• A tooth infection or abscess, especially in a back molar
• A cracked tooth
• Impacted or erupting wisdom teeth
• Sinus infection, which can cause pain in the upper back teeth
• Ear infection
• Nerve pain in the face

Rarely, jaw pain on the left side together with chest pressure, shortness of breath or sweating can be a sign of a heart problem. If you have those symptoms, call 911 right away.

What you can try at home

Most jaw pain from muscles settles with gentle care over days to a few weeks. These steps are safe for most people.

1. Rest the jaw. Choose soft foods such as soup, eggs, yogurt, pasta, fish and cooked vegetables for a few days. Cut food into small pieces.
2. Avoid wide opening. Support your chin when you yawn. Skip large burgers and whole apples.
3. Use warmth. A warm, moist cloth on the sore muscles for 10 to 15 minutes, a few times a day, helps them relax. Some people prefer a cold pack for a fresh injury.
4. Gentle movement. Slowly open and close within a comfortable range. Do not force it.
5. Lips together, teeth apart. Check through the day that your teeth are not touching. The tongue rests lightly on the roof of the mouth.
6. Stop chewing gum. Give the muscles a break.
7. Watch posture. Raise your screen to eye level and take breaks from looking down at your phone.
8. Over-the-counter pain relief. If safe for you, a pharmacist can help you choose. Follow the label and do not rely on it daily for weeks.
9. Manage stress. Walking, stretching, slow breathing and good sleep all help the jaw relax.

How a dentist assesses jaw pain

At a visit, your dentist will usually:

1. Ask when the pain started, what makes it better or worse, and whether you grind or clench.
2. Measure how wide you can open and watch how the jaw moves.
3. Listen for clicks or grating.
4. Gently press on the jaw muscles and joints to find tender spots.
5. Check the teeth, fillings and bite for wear or high spots.
6. Take x-rays to rule out tooth problems. Where more detail of the joint or bone is needed, 3D imaging such as CBCT may be suggested.

If the findings point to another cause, such as an ear or nerve problem, you may be referred to your doctor.

Treatment options at the clinic

Custom night guard or splint

A custom appliance worn at night spreads the forces of clenching, protects the teeth and lets the muscles relax. For many people it is a first step. It is adjusted so the bite meets it evenly. Store-bought guards that fit unevenly can sometimes make jaw pain worse.

Bite adjustment

If a recent filling or crown is high, a small adjustment can bring the bite back into balance. Major reshaping of healthy teeth is not a routine treatment for jaw pain.

Treating tooth problems

If a cracked tooth, infection or wisdom tooth is part of the problem, treating it often eases the jaw too.

Exercises and referrals

Your dentist may show you simple jaw exercises. Some patients benefit from physiotherapy, massage therapy or stress support. In persistent cases, your dentist or doctor may refer you for further assessment.

What to do if your jaw locks

If your jaw locks open and you cannot close it, or locks closed and you cannot open more than a little, stay calm. Do not force it. Apply warmth, relax your shoulders, and call the clinic. A jaw that is stuck open after a yawn or a blow to the face may need urgent care, so call us right away or go to an emergency department if you cannot reach us. We offer same-day emergency visits, and you do not need to be an existing patient.

Daily habits that protect the jaw

• Keep your teeth apart when you are not eating.
• Cut food into smaller pieces instead of biting into large items.
• Chew on both sides of the mouth.
• Avoid nail biting, ice chewing and holding pens in your teeth.
• Sleep on your back or side with good neck support, rather than face down with the jaw pushed to one side.
• Wear your night guard every night if you have one.
• Take short breaks during long phone calls and screen work.

Steps to take

1. Note when the pain occurs, what triggers it and whether there is clicking or locking.
2. Try soft foods, warmth and rest for several days.
3. Ask family whether you grind at night.
4. Book a dental exam if pain lasts more than two weeks or keeps returning.
5. Bring a list of medications and any recent dental work to the visit.
6. Follow the plan, which may include a custom guard and daily habit changes.

What to avoid

• Forcing the jaw open when it feels stuck.
• Chewing gum or tough foods during a flare-up.
• Repeatedly clicking the jaw on purpose.
• Wearing a store-bought guard that changes your bite.
• Ignoring tooth pain that may be the real cause.

Jaw soreness after dental work

It is common for the jaw to feel tired or stiff for a day or two after a long dental appointment, especially after a root canal, a wisdom tooth removal or several fillings at once. The muscles were stretched open for a long time, and the injection site may be a little tender. Warmth, soft foods and gentle opening and closing usually help within a few days.

If you know your jaw tires easily, tell us before the appointment. We can plan shorter visits, give you breaks to close and rest, and use a small bite block that supports the jaw so the muscles do not have to hold it open. Call the clinic if soreness after treatment gets worse instead of better, if you cannot open more than a little, or if swelling or fever appears, because these can point to something other than muscle strain.

Desk work, phones and the jaw

Posture affects the jaw more than most people expect. When the head moves forward to look at a laptop or phone, the muscles at the back of the neck and under the jaw work harder to hold it up, and the jaw tends to close and clench. Over a long workday that can add up to a sore face by evening.

A few changes help. Raise your screen so the top is near eye level. Hold your phone higher instead of looking down at it. Use a headset for long calls rather than cradling the phone between ear and shoulder. Stand up and roll your shoulders every half hour. These small steps take pressure off the neck and jaw and work well alongside a night guard and home care.

When to see a dentist

Book a visit if jaw pain lasts more than a couple of weeks, keeps coming back, makes chewing hard, or comes with clicking and catching. Call us the same day if your jaw locks, your bite suddenly changes, or swelling or fever appears. Learn more on our night guards and TMJ page.

Frequently asked questions

Is a clicking jaw a problem?

Clicking without pain or locking is common and often needs no treatment. If it becomes painful or the jaw catches, have it checked.

Can TMJ pain go away by itself?

Many muscle-related cases settle with rest and self-care. Ongoing pain or locking needs an exam.

Can stress really cause jaw pain?

Yes. Stress often leads to clenching during the day and grinding at night, which tires the jaw muscles.

Will I need surgery?

Surgery is rare for jaw pain. Most people are treated with self-care, a night guard, exercises and treating any tooth problems.

Can a dentist help with ear pain?

If the ear itself is healthy, ear pain can come from the nearby jaw joint and muscles. A dental exam can help find the cause.

Should I use heat or ice?

Warmth helps tight muscles relax. Cold can help in the first day or two after an injury. Use whichever feels better.