Dental sealants are thin, protective coatings applied to the chewing surfaces of molars and premolars. They help prevent cavities by sealing the grooves and pits where food particles and bacteria can accumulate. Sealants are typically made from a plastic material and are most commonly used for children, but adults can benefit from them as well. The application process is quick and painless. A dentist cleans the tooth surface, applies an acid solution to help the sealant bond, and then paints the sealant onto the tooth. Once it hardens, it provides a durable barrier against decay for several years.