My dentist says I'm a champion grinder. I wear a mouthguard all the time. I take it out to eat, then brush my teeth and put it back in. Evidently my jaws don't line up properly so I grind trying to get my teeth in alignment. I used to get severe headaches from the night grinding. I'd do braces, but I have had so much dental work done (crowns and such) that the estimate they gave me to realign it was $10,000 to $14,000. The $400 guard works, so I'll stick with it for now.

Definitely have his dentist look at it and you can get a referral to a prosthodontist to see what they can do to help him.