Sealants are a type of flowable tooth colored filling material that are often placed in the molars of children and young adults.  Some teeth have very deep grooves that tend to trap food debri and are, therefore, more susceptible to decay.  Sealants are placed to fill in these deep grooves, making them less likely to trap debri, and easier to clean.  Often times no drilling is necessary to place a sealant.  On occasion, the dentist may want to conservatively open up the grooves to verify that no decay is present.  In these instances, anesthetic is typically not necessary, because only the outermost portion of tooth structure is minimally removed.  Sealants are a great conservative treatment that can help prevent future decay.