I would talk to a dentist about it.

A guy I work with grinds his teeth, and is having a really bad time with is mouth lately. He was wearing a retainer, and a mouth guard, but neither were helping, and he was getting horrible migraines every day too, and in so much pain.
He saw 2 or 3 dentists, when finally one told him he had TMJ (I don't know the actual term for it).

His case is a bit extreme, but I would hate for Jaden to have to be in so much pain.