Stress management techniques such as biofeedback or physical therapy may also be recommended, as well as a temporary, clear plastic appliance known as a splint. A splint (or nightguard) fits over your top or bottom teeth and helps keep your teeth apart, thereby relaxing the muscles and reducing pain. There are different types of appliances used for different purposes.nnA nightguard helps you stop clenching or grinding your teeth and reduces muscle tension at night. It also helps to protect the cartilage and joint surfaces. An anterior positioning appliance moves your jaw forward, relieves pressure on parts of your jaw, and aids in disk repositioning. It may be worn 24 hours/day to help your jaw heal. An orthotic stabilization appliance is worn 24 hours/day, or just at night, to move your jaw into the proper position. Appliances also help protect tooth wear.