Jaw Disorder (TMJ Disorder)

The jaw joint

The temporomandibular joint connects the lower jaw (mandible) to the skull just in front of each ear. A small cartilage disc cushions the joint, and several muscles open, close and move the jaw side to side. It is one of the most used joints in the body, working with every chew, word and swallow.

Types of TMJ disorder

Many people have more than one type.

Causes and risk factors

• Clenching and grinding (bruxism), especially at night or during concentration
• Stress, anxiety and poor sleep
• Habits: gum chewing, nail biting, chewing pens, resting the chin on the hand
• Jaw injury or prolonged wide opening at the dentist
• Arthritis: osteoarthritis, rheumatoid arthritis and others
• Posture: forward head posture and neck tension
• Other pain conditions: fibromyalgia, migraine, chronic fatigue, irritable bowel syndrome

Female sex is a strong risk factor, possibly related to hormones and pain sensitivity.

Symptoms

• pain or aching in the jaw, in front of the ear, cheeks or temples
• clicking, popping or grating when opening or chewing
• difficulty opening the mouth wide
• jaw locking open or closed
• earache, fullness or ringing without an ear infection
• headaches, especially in the temples and on waking
• a change in how the teeth fit together
• tooth sensitivity or worn teeth from grinding
• neck and shoulder pain

Conditions that can mimic TMJ pain

• dental problems: abscesses, cracked teeth, wisdom teeth
• ear infections
• sinusitis
• trigeminal neuralgia: brief electric-shock pains
• giant cell arteritis
• salivary gland problems
• heart attack, which can cause jaw pain
• rarely, tumors

Diagnosis

A dentist, oral surgeon or doctor will ask about pain, clicking, locking, clenching, stress and headaches, and examine:

• how wide and straight the mouth opens (normal is about 40 to 50 mm, roughly three fingers' width)
• joint sounds
• tenderness of the joint and muscles
• teeth and bite

Imaging is needed only for specific concerns: panoramic dental X-ray, CT for bone changes, or MRI to view the disc in persistent locking or suspected internal problems.

Treatment

Most TMJ problems improve with conservative care. Irreversible treatments, such as grinding down teeth, are generally not recommended.

Self-care

• Rest the jaw: eat soft foods, cut food small, avoid gum, tough meat, hard bread and wide yawns.
• Heat or cold: a warm compress for muscle ache or an ice pack wrapped in cloth for acute pain, 10 to 15 minutes at a time.
• Relaxed jaw position: "lips together, teeth apart, tongue resting on the roof of the mouth."
• Notice and stop daytime clenching.
• Gentle jaw exercises and massage of the cheek and temple muscles.
• Manage stress and improve sleep.
• Pain relief: acetaminophen (paracetamol) or ibuprofen at the label dose, if safe for you.

Professional treatments

• Night guards (occlusal splints): custom-fitted by a dentist to reduce the effects of grinding and protect teeth.
• Physical therapy: jaw and neck exercises, posture work, manual therapy.
• Medicines: short courses of anti-inflammatories or muscle relaxants; low-dose tricyclic antidepressants for chronic pain.
• Cognitive behavioral therapy and biofeedback for pain and clenching linked to stress.
• Injections: steroid injections into the joint for arthritis; botulinum toxin is sometimes used for muscle pain, though evidence is mixed.
• Arthrocentesis: washing out the joint with fluid, for a locked jaw or inflammation.
• Surgery: arthroscopy or open joint surgery, or joint replacement, only for specific structural problems that do not respond to other treatment.

Outlook

Most people improve within weeks to a few months. TMJ symptoms can come and go with stress or habits, so continuing self-care helps prevent flares. A small number develop chronic pain that benefits from a multidisciplinary approach.

Frequently asked questions

What are the symptoms of a TMJ disorder?

Common symptoms are jaw pain, pain in front of the ear, clicking or popping, difficulty opening the mouth wide, jaw locking, earache, headaches in the temples, and tenderness of the chewing muscles. Symptoms often worsen with chewing or stress.

What causes TMJ disorders?

The most common causes are muscle tension from clenching or grinding the teeth, often linked to stress and poor sleep. Others include displacement of the cartilage disc, arthritis, jaw injury and habits such as gum chewing. Often several factors combine.

Will TMJ go away on its own?

Often, yes. Many TMJ problems improve within weeks to months with simple self-care: soft foods, resting the jaw, heat, gentle exercises and stress management. If pain persists beyond a few weeks, a dentist or doctor can offer night guards, physical therapy and other treatments.

Is jaw clicking a problem?

Painless clicking with normal opening is very common and usually needs no treatment. Clicking with pain, catching, locking or reduced opening suggests disc displacement or joint problems, and should be checked by a dentist or doctor.

Can TMJ cause ear pain and ringing?

Yes. The jaw joint sits just in front of the ear, so TMJ problems often cause earache, a feeling of fullness and sometimes ringing in the ears. If the ear itself looks normal on examination, the jaw may be the source.