The temporomandibular joint is one of the most complex joints in the body. The healthy TMJ opens and closes like a hinge but also allows the lower jaw to slide forward. There are two TMJ’s, located right in front of each ear. The temporomandibular joint is affected by physical and emotional stress. What’s more, the joint is constantly affected by the mechanics of your bite and your jaw movements. Stress, fatigue, jaw muscle tension, and changes in your bite can all affect the TMJ. Many people have problems with TMD. These problems with the TMJ are collectively called TMD—Temporomandibular Disorder.