Sealants are thin “coatings” applied to the chewing surfaces of teeth that are not decayed or in their early stages. Sealants are applied by a dentist. Applying sealants is painless and simple. Sealants are applied in liquid form, hardening to form a protective layer on the tooth surface. The main reason for applying sealants is to prevent tooth decay. Fluoride in toothpaste protects the smooth surfaces of teeth, but back teeth need extra protection. Sealants fill the depressions in the chewing surfaces, eliminating the accumulation of food debris and bacteria. Children should have their permanent molars sealed as soon as they erupt before cavities appear. The first permanent tooth erupts between the ages of 5 and 7. The second deciduous tooth erupts between the ages of 11 and 14. Other teeth with depressions and pits may need sealing. Adolescents and young adults who are prone to cavities may also need sealants.