The most likely place to get cavities is in the biting surfaces of your back teeth (molars). Bacteria and food hide in these areas and toothbrush bristles are unable to get into the deep grooves and pits in order to clean them. Sealants are small pieces of plastic that are placed in the deepest grooves of these teeth to protect them from getting decay. We recommend sealants be placed once when the 6 year molars fully erupt (about 7 years of age) and again when the 12 year molars fully erupt (about 13 years of age).