The premolar and molar teeth are the largest teeth in the mouth. They have a larger surface area and have several grooves and pits on the chewing surface. These grooves can be deep and are a prime place for plaque to build up and cause cavities. It is for this reason that Dr. Rigden may suggest applying sealants, especially on young children. A sealant is a coating that is applied to the chewing surface of the teeth creating a smooth surface to act as a barricade protecting it from decay. Applying a sealant is a quick, easy procedure that does not involve any anesthetic.  Sealants are very effective in preventing decay and in some cases can prevent additional damage where decay has already begun.