Sealants are a type of preventive treatment.
When your tooth has deep pits or grooves on the chewing surface, your tooth brush bristles cannot effectively clean these areas out, resulting in cavities from food and plaque becoming trapped in these surfaces. To prevent tooth decay the dentist will clean out the grooves very well and place a very thin layer of filling material to seal over the pits and grooves to keep food, plaque and bacteria away from the tooth. Sealants are most effective in children and young adults.