I have had tmj problems long before any other PD symptoms, my jaw is still very tight. If you google TMJ + Parkinson's you will fidn some youtube videos of people who have been treated by dentists specialising in TMJ problems. A specially fitted mouthguard seems to lessen the symptoms dramatically. I live in teh UK and can't find a dentist with the right training but if I was in teh US this is something I would definitely try. An osteopath told me many years ago that he had never seen anyone with such an unusual bite as mine. It's like my bottom jaw is pushed back.

Trixiedee