Dental sealants will protect teeth from decay, but need to be checked for wear and chipping at regular dental visits. A sealant is a thin, plastic coating applied to the chewing surface of molars, premolars and any deep grooves (called pits and fissures) of teeth. More than 75% of dental decay begins in these deep grooves. Teeth with these conditions are hard to clean and are very susceptible to decay. Dental sealants protects the tooth by sealing deep grooves, creating a smooth, easy to clean surface.