The top surfaces of your teeth – where the chewing takes place – aren’t smooth and flat. They are cris-crossed with tiny hills and valleys – called pits and fissures. These are places where plaque can build up safe from your toothbrush and dental floss. Some of the pits and fissures are so narrow that even a single bristle from your toothbrush can’t get deep enough to clean them out.
One method of preventing cavities from developing in the pits and fissures is to seal them off with a special varnish called a pit and fissure sealant.