A sealant is a proven technology to help prevent decay. A sealant is a resin material that is applied to the chewing surfaces of the back teeth. Decay occurs most often in these areas due to the deep grooves and pits. The sealant acts as a barrier, protecting the enamel from plaque and acids which causes decay. Sealants are applied as soon as the 6 year molars erupt and after the eruption of the 12 year molars.