The best mouthguards are custom-made to fit your mouth and teeth precisely and are designed to provide you with the best level of protection. In order to manufacture this type of sports guard, an impression of your teeth is taken and sent to a dental lab. These mouthguards are usually fabricated from acrylic. Since they offer the best protection, customized mouth guards are more expensive than store-bought mouthguards. Please note that some insurance companies may cover the cost of a sports guard.