One of the common causes is grinding your teeth while you are asleep. A tooth brace often helps this. It can also be caused by severe stress or an injury to the neck or head. TMJ can also be responsible for neck pain. This will help to relax the muscles of the jaw.
Frequency is the key factor.
This excercise also helps to relax the joint. Hope this helps you. 4012 Rainbow Ste. Copyright 1999-2001 Reflexology Association of America. All rights reserved.