Splints and mouthguards are both appliances recommended to protect your teeth or dental work. Splints (nightguards) are recommended for people that grind or clench their teeth. A splint protects teeth and dental work from wear, fractures, and chipping. In many cases teeth clenchers can have sore jaw joints and even headaches. Splints can come in different designs depending on a person’s bite and preference. Mouthguards are recommended for people that practice contact sports where accidents can easily occur and can damage ones teeth.