If you were watching the Australian Open tennis recently, you may have noticed Milos Raonic from Canada wearing a small "mouthguard." After a run of bad injuries to his feet and spine (all the while, complaining of grinding his jaw), he finally visited a dentist. It took numerous adjustments, but finally he got the mouth orthotic fitting correctly. As he explains "It's sort of like orthotics, but starting from the top. You try to sort of align everything so it sits in the right place, muscles don't get tense."
This kind of thinking is fairly new, but those patients who have received treatment to their jaw with these orthotics, will often find that the rest of their body aligns and problem areas in other parts of their body greatly improve.
http://www.wsj.com/articles/the-mouth-guard-that-keeps-milos-raonic-loose-1453746321