You see, nobody know exactly why it happens, but TMJ is caused by most
of the muscles in the head (including the throat, tongue, jaw and the
shoulders) to stiffen up. This causes the pain and dysfunctions in this
area.
But strengthening and relaxing the jaw alone won't cure your TMJ. You
see, the worst problem of TMJ is that all the muscles in the head work
together to dislocate the jaw joint.
The program finally solves that by working on relaxing and
strengthening every muscle in your head, from the inside out.
http://tmj.stinkingfart.com/relief.htm