The splint is usually made of processed acrylic resin or plastic. It guides the jaw when it moves sideways or m front-to-back. It aims to protect the teeth from harmful habits and supports the TMJ and associated muscles while eating. The splints are used for a short time. It does not lead to a permanent change in the teeth or jaw. Also called occlusal splints, dental splints are made to fit between and over your upper and lower teeth. A dental splint relaxes the muscle, lowers the toothache and pain, and stabilizes the jaw by preventing teeth clenching or bruxism. Splints can be worn at night.