Muscle relaxers will hurt your internal organs by relaxing them also. Something to consider if you are detoxing, relaxed kidneys will not be helpful.

I would try simply massing the area gently for a few days, maybe use a mild heat pad, or warm washcloth. Warm oil, coconut for instance may also be helpful, mild and compatable enough. Castor oil is known to help draw out toxins.

The magnesium also sounds good.

Personally I think you all might have mercury in your gums and jaw muscles, all my teeth hurt also after some bad dentistry, it went away within a few hours of a DMPS IV (after weeks of suffering).