What is TMJ / TMD?

Your temporomandibular joint is a hinge that connects your jaw to the temporal bones of your skull, which are in front of each ear. It lets you move your jaw up and down and side to side, so you can talk, chew, and yawn.

Problems with your jaw and the muscles in your face that control it are known as temporomandibular disorders (TMD). But you may hear it called TMJ, after the joint.

What Causes TMD?

Dentists believe symptoms arise from problems with the muscles of your jaw or with the parts of the joint itself.

Injury to your jaw, the joint, or the muscles of your head and neck — like from a heavy blow or whiplash — can lead to TMD. Other causes include:

  • Grinding or clenching your teeth, which puts a lot of pressure on the joint
  • Movement of the soft cushion or disc between the ball and socket of the joint
  • Arthritis in the joint
  • Stress, which can cause you to tighten facial and jaw muscles or clench the teeth

What Are the Symptoms?

TMD often causes severe pain and discomfort. It can be temporary or last many years. It might affect one or both sides of your face. More women than men have it, and it’s most common among people between the ages of 20 and 40.

Common symptoms include:

  • Pain or tenderness in your face, jaw joint area, neck and shoulders, and in or around the ear when you chew, speak, or open your mouth wide
  • Problems when you try to open your mouth wide
  • Jaws that get “stuck” or “lock” in the open- or closed-mouth position
  • Clicking, popping, or grating sounds in the jaw joint when you open or close your mouth or chew. This may or may not be painful.
  • A tired feeling in your face
  • Trouble chewing or a sudden uncomfortable bite — as if the upper and lower teeth are not fitting together properly
  • Swelling on the side of your face

You may also have toothaches, headaches, neck aches, dizziness, earaches, hearing problems, upper shoulder pain, and ringing in the ears (tinnitus).

How Is TMD Diagnosed?

Many other conditions cause similar symptoms — like tooth decay, sinus problems, arthritis, or gum disease. To figure out what’s causing yours, the dentist will ask about your health history and conduct a TMJ exam.

TMJ Exam:

A Dentist will check your jaw joints for pain or tenderness and listen for clicks, pops, or grating sounds when you move them. He’ll also make sure your jaw works like it should and doesn’t lock when you open or close your mouth. Plus he’ll test your bite and check for problems with your facial muscles.

Your dentist may take full face X-rays so he can view your jaws, temporomandibular joints, and teeth to rule out other problems.

You may get referred to an oral surgeon (also called an oral and maxillofacial surgeon) for further care and treatment. This doctor specializes in surgery in and around the entire face, mouth, and jaw area. You may also see an orthodontist to ensure your teeth, muscles, and joints work like they should.

Traditional Treatments

Talk to your dentist about these tried-and-true treatments for TMD:

  • A splint or night guard. These plastic mouthpieces fit over your upper and lower teeth so they don’t touch. They lessen the effects of clenching or grinding and correct your bite by putting your teeth in a more correct position. What’s the difference between them? You wear night guards while you sleep. You use a splint all the time. Your dentist will tell you which type you need.
  • Dental work. Your dentist can replace missing teeth and use crowns, bridges, or braces to balance the biting surfaces of your teeth or to correct a bite problem.