It's probably one of the ones that was featured in the NYT a couple of weeks ago.

<digging around for a link> here it is.

I'm seriously considering one of those, if they can also be used as night guards (and I don't see why not). I have pretty bad jaw alignment/bruxism issues, and I had a night guard that I wore, but it needed pretty frequent adjustment. For other reasons I quit going to the dentist who made it for me and I couldn't find anyone else to adjust it. Eventually it got so far out of adjustment that it was worse for me to wear it than to do without.

I need PT for my feet first... then I'll work on the jaw.