Dental sealants act as a barrier to prevent cavities. They are a plastic material usually applied to the chewing surfaces of the back teeth where decay occurs most often. The sealant is painted onto the tooth enamel, where it will be securely bonded directly to the tooth. The sealant acts as a barrier, protecting enamel from plaque and acids. As long as the sealant remains intact, the tooth surface will be protected from decay. The likelihood of developing pit and fissure decay begins early in life, so children and teenagers are good candidates. However, adults can benefit from sealants as well.