Temporomandibular Joint Disorder (TMJ Disorder)

The jaw joint

The temporomandibular joints, one in front of each ear, connect the lower jaw (mandible) to the skull. Each has a small cartilage disc between the bones, letting the jaw hinge and slide. Powerful chewing muscles move it. Problems with the muscles, disc or bones cause TMD.

Types of TMJ disorders

Symptoms

• pain in the jaw, in front of the ear, cheeks or temples
• clicking, popping or grating sounds when opening or chewing
• limited mouth opening or a jaw that locks open or closed
• pain when chewing, yawning or talking
• headaches, often tension-type around the temples
• ear pain, fullness or ringing without an ear infection
• a change in how the teeth fit together
• neck and shoulder pain

Clicking without pain is common and usually needs no treatment.

Causes and risk factors

• clenching and grinding (bruxism), often during sleep or under stress
• stress, anxiety and depression
• jaw injury or whiplash
• arthritis: osteoarthritis or rheumatoid arthritis
• habits: gum chewing, nail biting, chewing pens, resting the chin on the hand
• posture: forward head posture
• other pain conditions: fibromyalgia, migraine, chronic headaches, irritable bowel syndrome
• sleep problems and sleep apnea
• female sex and hormonal factors

Diagnosis

A dentist, oral surgeon or doctor will:

• ask about symptoms, habits and stress
• examine jaw movement, measure how wide you can open, feel the muscles and joints, and listen for sounds
• check the bite and teeth for wear
• rule out dental problems, ear infections, sinusitis and nerve pain

Imaging (X-rays, CT, MRI of the joint) is reserved for suspected arthritis, disc problems that do not improve, injury or before surgery.

Treatment

Self-care (first line)

• eat soft foods; cut food into small pieces; avoid gum, chewy and hard foods
• avoid wide yawning and excessive jaw movements
• apply moist heat or cold packs to the jaw for 10 to 20 minutes
• keep teeth apart and jaw relaxed during the day: "lips together, teeth apart, tongue resting on the roof of the mouth"
• gentle jaw stretches and exercises as taught by a clinician
• manage stress with relaxation, breathing and exercise
• improve posture and sleep

Medicines

• NSAIDs such as ibuprofen or naproxen for short periods, following the label dose
• muscle relaxants or low-dose tricyclic antidepressants prescribed for some people

Other treatments

• oral appliances: a night guard or stabilization splint fitted by a dentist reduces grinding damage and may ease pain
• physical therapy: jaw exercises, manual therapy, posture training
• cognitive behavioral therapy for chronic pain and stress
• trigger point or Botox injections for selected cases

Procedures and surgery

Irreversible treatments, such as grinding down teeth, orthodontics to "fix the bite," or joint surgery, are rarely needed and should be considered only after conservative care fails. Options include arthrocentesis (washing out the joint), arthroscopy, and in severe cases open joint surgery or replacement.

Outlook

Most people improve within weeks to months, and many have occasional flare-ups. A minority develop chronic pain, which responds best to a combined approach of self-care, therapy and stress management.

Frequently asked questions

What are the symptoms of TMJ disorder?

Common symptoms include jaw pain, clicking or popping, difficulty opening the mouth, jaw locking, pain when chewing, headaches around the temples, and ear pain or fullness. Symptoms often worsen with stress, chewing or clenching.

What causes TMJ problems?

TMJ disorders often result from jaw muscle tension, teeth clenching or grinding, stress, a displaced joint disc, arthritis or injury. Habits like gum chewing and poor posture can contribute. Often several factors combine.

How do I fix TMJ pain at home?

Rest the jaw with soft foods, avoid gum and wide yawning, apply heat or cold, keep your teeth apart and jaw relaxed, do gentle jaw exercises, and manage stress. Short courses of ibuprofen can help. Most cases improve within weeks.

Can TMJ cause ear pain?

Yes. The jaw joint sits just in front of the ear, so TMD often causes ear pain, fullness or ringing without an ear infection. If ear symptoms persist, a doctor should check the ears too.

Does a night guard help TMJ?

A dentist-fitted night guard can reduce damage from grinding and relieve jaw pain for some people, especially when clenching at night is involved. It works best alongside self-care, stress management and exercises.