Sealants are a preventive service for children. Sealants are a resin material usually white or clear that is placed in the pits and grooves of the back teeth by the dentist or dental hygienist to help prevent dental decay in these areas. They usually last a short time and need to be replaced but they are an excellent way to help prevent dental decay in children, requires no anesthetic and is a pain free procedure. Read about choosing dental products for proven and effective care at home.