The permanent molars are the most common teeth on which dental sealants are placed. In many cases, it is nearly impossible for children to clean the tiny deep and narrow grooves on the chewing surfaces of their back teeth. This may result in an accumaulation of plaque and bacteria, and a cavity may eventually form. When a sealant is applied, these grooves and crevices on the biting surfaces of the tooth disappear as they are filled with a liquid that is flowed into grooves and then hardened into a (BPA-free) plastic.

When the grooves are sealed, food, plaque and bacteria can no longer get stuck in them, and cavities on the chewing surfaces of the teeth are much less likely to occur.