Pit and fissure sealants are simply bonded resin coverings that are applied to the deep grooves and fissures of a young tooth. This material helps to prevent tooth decay in these tough to brush areas. These restorations are typically placed in children, but occasionally they are placed in adult teeth. Sealants are a wonderful deterrent to tooth decay in little ones and they have revolutionized pediatric dentistry in regards to decreasing tooth decay. Sealants are usually placed starting at about age six, when the permanent first molars start to erupt.