Sealants are thin plastic coatings applied in the dental office on the chewing surfaces of back teeth, which are prime spots for cavities. Sealants act as a barrier to prevent bacteria and food from collecting and sitting on the grooves and pits of teeth. Sealants are best suited for permanent first molars which erupt around the age of 6 and second molars that erupt around the age of 12. It is important to have the sealant applied as soon as the tooth has fully come in. They are also indicated on the pre-molars if there are deep pits and fissures present. Sealants are nearly 100% effective in preventing decay in the chewing surfaces of the back teeth. Fluoride helps fight decay on the smooth surfaces of the teeth.