The Stressgard is uniquely designed by an orthodontist with a patented flexible groove to help you deal with the daily stress and tension that may cause you to clench and grind. Simply place it between your teeth and you begin to learn to break the cycle of overactive (clenching) jaw muscles. You learn to relax your jaw thereby reducing clenching and the harmful effects of grinding your teeth. There are other products in the marketplace to help treat the symptoms of clenching (bruxing) and grinding. But none are as unobtrusive and comfortable as the StressGard. The StressGard can also be worn comfortably on the upper or lower teeth. Indeed unique. Always consult your healthcare professional for TMJ concerns.