1. Lightly touch the roof of your mouth behind your front teeth with your tongue often during the day. Over time this will help relax your jaw muscles. This even carries over into the evening and can help stop grinding your teeth at night.
2. Standing closely in front of a mirror with your index fingertips on either side at the end of your chin: SUPER SLOWLY open your jaw as far as you can comfortably. If your jaw pulls/moves more to one side, use your fingertip on that side to make it go straight. Continue all the way open and all the way closed 6 times. Repeat morning and evening.