Sealants¬†are plastic coatings that protect those difficult to reach pits and grooves on the chewing surfaces of the teeth from the bacteria that cause tooth decay. A quick and painless procedure done in your dentist’s office, sealants are applied to the chewing surfaces of permanent molars as soon as possible after they fully erupt in the mouth, usually between the ages of 6 to 8 for first molars and 10 to 12 for second molars.