The temporomandibular joints are your jaws. Jaw pain can occur as a result of the joint being in a bad position and not moving properly when we eat or talk. That dysfunction is what is tested and treated in TMD. Stress and sleep behaviours like grinding the teeth or clenching the jaw for hours on end can trigger muscle tension and knots which further aggravate jaw pain. Unfortunately the pain is rarely limited just to the jaws; upper back, neck, face and head muscles are also affected. Massage therapy can treat all muscles groups and, some therapists are even trained to work inside the mouth as a dental hygienist would.
Please take a look at the other conditions that can be treated by massage therapy.