A dental sealant is a thin, plastic coating that is applied to the chewing surfaces of the tooth. Usually the pre-molars and molars, or back teeth, are sealed to prevent tooth decay caused by plaque and food. Children and teenagers are candidates for sealants as decay on the occlusal, or chewing surface of the teeth, starts shortly after the teeth erupt. The sealant bonds to the grooves and depressions of the tooth creating a protective shield over the enamel of the tooth. It is important to see a dentist regularly to check that the sealant is still intact.