oh boy, do I ever know about clenching... I never thought about whiplash/neck injury as part of a cause, though, because my C1 is twisted due to what I believe to be a pretty nasty forceps delivery.

I've just spent close to $3000 on dental work in the past month; in the last 20 years I've probably spent over $10000 due to my excessive clenching (and yes, this is with a super fancy "balanced" nightguard that cost a grand and was supposed to help with headaches and clenching but nada).

My dentist suggest botox injections to relax my jaw muscles and the insurance company actually approved it, but it's only a temporary fix and not being able to chew normally scared me. It's temporary but it's still a few months if I don't like it.

My friend who is a dentist says counseling helps, that it's something from the subconscious. I resisted this, but the neck injury theory does sound plausible. I've done cranial sacral massage/osteopathy recently due to the excessive dental work I'm going through right now; she said my jaws were completely locked up and I was getting horrifying headaches that no pain medication helped.

Sorry this is more of my own woes and rant rather than helpful advice. I guess in the end, I'm a total pro at clenching my teeth, but aside from slowing the rate of breaking my teeth I haven't done a whole lot to address it. I'll be curious to find out if you'll come across a treatment that will help.