Temporomandibular joint disorder (also known as TMJ) is a chronic, degenerative disease that may take years to develop. People who suffer from TMJ have a structural imbalance in their jaw-to-skull relationship caused by a poor bite. This condition puts excessive pressure on the joints and surrounding tissues, twisting the jaw into an unnatural, tensed position. Often, a popping or clicking sound can actually be heard when a TMJ sufferer chews. Muscles in the face, back, neck and shoulders may also be affected, leading to symptoms that range from headaches to numbness in the hands.