Sealants are typically placed on adult molars not long after the tooth erupts. The first adult molars come in between 5-7 years of age and the second molars and normally around 12 years. The goal is to seal off the grooves and pits of the teeth to prevent bacteria from entering and causing a cavity. Sometimes the grooves on teeth go all the way into the second layer of the tooth making the possibility of getting a cavity very high. Sealants are very quick to replace and require no anesthesia. Sometimes very minimal drilling is required to remove any “sticky” tooth structure before placing the sealant. Even in these cases, using anesthesia is rare.