The most important reason for getting sealants is to avoid tooth decay. Sealants are used to fill in narrow grooves in a tooth that cannot be adequately cleaned by brushing alone. Typically, children have sealants placed on the first and second permanent molars. Getting sealants put on is simple and painless. Sealants are applied as a liquid and quickly harden to form a shield over the tooth. In the long run, sealants will save time and money by avoiding fillings or crowns used to fix decayed teeth.