@amsden2000 - You might also try rubbing mint oils on your jaw. Just rubbing it along your jawline can really help with tensing up. I personally have kava tea before bed, which is a muscle-relaxing tea. It causes a kind of tingling feeling in your mouth when you drink it -- which is soothing to sore jaws.
Whenever I get jaw pain myself, it's usually the first sign that a tension headache might be on the horizon. I'll try your jaw relaxing technique -- maybe it will help.