A mouthguard is a protective device worn over the teeth to prevent injuries during sports or other physical activities. It cushions the teeth and gums, reducing the risk of fractures, dislocations, and other dental injuries. Mouthguards are commonly used in contact sports like football, boxing, and hockey. There are different types of mouthguards, including stock, boil-and-bite, and custom-fitted options. Stock mouthguards are pre-formed and ready to wear, while boil-and-bite mouthguards can be softened in hot water and molded to fit the wearer's mouth. Custom-fitted mouthguards, made by a dentist, offer the best fit and comfort.