A Fissure Sealant is a plastic resin that is bonded to the depressions, pits and deep grooves in your tooth’s chewing surface. Fissure Sealants are usually placed in permanent molar and premolar teeth (i.e. the back teeth). When fissure sealing a tooth, the grooves of the teeth are filled and the tooth surface becomes lovely and smooth; the sealant essentially acts as a barrier, protecting enamel from plaque and acids.
When the back teeth are developing, pits and fissures form in the chewing surfaces of the enamel. They are impossible to keep clean, because the bristles of a toothbrush cannot properly reach them. Pits and fissures are snug places for plaque and bits of food to hide. Most cavities form in these areas; back teeth especially are extremely susceptible to this type of decay. By forming a thin covering over the pits and grooves, fissure sealants keep out plaque and food, thus decreasing the risk of decay.