Dental sealants are effective in the prevention of decay on the biting surfacing of molars. Permanent molars often form with deep crevices on the chewing surface. As food, dental plaque, and bacteria are trapped in these grooves, decay will start to invade the tooth even deeper. After thoroughly cleaning out these crevices and preparing the tooth surface a resin composite sealant can protect these teeth for several years. Sealants provide a smooth and easy to clean chewing surface that seals out harmful bacteria that may cause decay. If done early enough before tooth breakdown occurs, these preventive sealants offer a great protection.