Have you heard about sealants? A better question maybe, have you heard of Thomas' English Muffin? Their catch phrase was "it has lots of nooks and crannies to hold the melted butter." The top chewing surface of many posterior teeth have grooves and pits. These trap and retain food that feed the bacteria that causes cavities. This is where sealants come in. Sealants are a protective layer placed over the bitting surfaces of teeth to provide protection.