Jaw Rx-Ercises are a set of jaw exercises designed to help patients avoid daytime clenching or setting of teeth that causes jaw and temple muscles to overwork and become sore. Masseter or jaw muscle soreness can be a trigger for headaches and/or jaw pain. Performing Jaw Rx-Ercises throughout the day for up to one week will retrain the jaw muscles and brain to relax the jaw in a comfortable resting position, keeping teeth apart and tongue up.