The TMJ is a very complicated joint. An articular disc sits on the mandibular condyle (ball) for all jaw movements and separates the condyle of the lower jaw from the socket on the skull. The most common cause of TMJ pain is when this disc slips off the lower condyle. This is thought to be caused by too much tension in the muscles that move the joint. Therapy may involve:
Custom splint therapy:
A resin appliance that is formed on a cast of the upper teeth. The splint is adjusted for even contact with the lower teeth with the goal of relaxing the muscles at an increased degree of jaw opening.
Ranges from pain medicine to steroids to low dose anti-depressants
This can involve simple things you can do at home including keeping your teeth apart, using moist heat, and self massage of jaw muscles