This may help
If stress is causing you to grind your teeth you may want to try attending stress counseling, or starting an exercise program to help relive stress
Other tips include
Do not chew on pencils or pens
Avoid chewing gum as it allows your jaw muscles to get more used to clenching and makes you more likely to grind your teeth.
Train yourself to stop grinding your teeth. If you notice that you are grinding your teeth during the day, position the tip of your tongue between your teeth.