A few tips were posted recently by the Dental Tribune on preventing teeth grinding. Here’s a few good ones:
1) Take a pain reliever.
If grinding and clenching is causing you headaches and muscle soreness in your jaw, take an anti-inflammatory medication, like Advil or Aleve, shortly before bedtime.
Try massaging the muscles along your jaw line, from the joint near your ear all the way to your chin to relieve jaw soreness.
3) Avoid caffeine.
Coffee may help you get going in the morning, but caffeine combined with stress can lead to increased muscle tension. Increase your consumption of water. If cutting caffeine completely from your life won’t work for you, at least try to avoid it within several hours of bedtime.
4) Wear a mouth guard.
If you have serious grinding and clenching issues, talk to your dentist about a mouth guard to wear at night.
More tips can be found here: http://www.dental-tribune.com/articles/content/scope/news/region/usa/id/1910