The TMJ is the only movable joint on the face. It facilitates movement of the lower jaw which helps you eat, talk etc. Like any other joint in the body, this goes through wear and tear and might become a cause for discomfort. This might be a result of problems like Myofacial Pain dysfunction Syndrome (MPDS), Internal Derangement or Arthritis of TMJ (Osteoarthritis or Rheumatoid Arthritis). Such conditions need to be dealt with a lot of care and expertise.