It is common to treat those teeth at risk of decay with sealants. Fissures are the grooves that naturally occur on the biting surfaces of molar teeth. If the fissures are deep and narrow the toothbrush bristles cannot clean out food particles which leave the tooth prone to decay. Fissure sealants are plastic coatings that fill the fissures and protect teeth from plaque build up and acid attacks. Your dentist may suggest the use of sealants after an examination of your child’s teeth.