Temporomandibular joint disorder (TMJ or TMD) refers to a classification of acute or chronic inflammation of the temporomandibular joint, which connects the jaw to the skull. Disorders in this region can result in pain and/or impairment in the face, jaw joint, neck and shoulders. Other symptoms include headaches, bite problems, popping or snapping sounds caused when the jaw is in motion, and difficulty moving the jaw or even experiencing it to be locked in one place. TMJ can be a significant medical concern, and should be diagnosed or ruled out by a physician or dentist if any of these symptoms occur. It is often treated with splints or guards for the bite, with medication, and with restorative dentistry or adjustment of the bite to bring it into balance.