Temperomandibular Joint ( TMJ) is the jaw joint which allows all functional movements of our jaws. Sometimes due to improper position of teeth or teeth loss causing drifting of teeth , an unnatural stress and strain develops in the discs and ligaments of the TMJ causing severe pain, crepitus , joint clicking . and lock jaws. In such conditions are called Temperomandibular Disorders ( TMDs). In TMDs certain appliances are used in the mouth to relieve the joint stress and improve joint function and relieve symptoms before starting fixed braces treatment to level deranged occlusion that is causing joint symptoms. These appliances are removable appliances and are used mostly continuously.