Dental sealants are thin plastic coatings applied to the grooves on the chewing surfaces of your molars to prevent tooth decay. Tooth decay often begins on these teeth because it’s easy for germs and food particles to build up on these grooves. The teeth that will get the most benefits from dental sealants are the permanent molars. These are the second set of molars that come into the mouth around the age of 12. Applying sealants as soon as the teeth erupt is the best course of action to prevent tooth decay.