A large percentage of tooth decay begins on the top surface of back teeth. Back teeth are cavity prone, because the small grooves in the chewing surface trap food particles and bacteria. Some grooves are so small at their narrowest point that a toothbrush bristle is too large to completely clean these grooves.

Dental sealants are clear, acrylic-like coatings applied to the chewing surfaces of the back teeth. The coatings fill in (seal) the grooves, making the tooth surfaces smooth and easier to clean. Sealants keep bacteria from entering the teeth and help to prevent tooth decay.

It is recommended that sealants be applied to a child's baby molars by the age of three or four. Once the six-year molars (the first permanent back teeth) appear, it is best to apply sealants as soon as possible. Sealants are appropriate for older children as well, because the most cavity-prone years continue until the mid-teens.

Sealants are durable and can last for several years. They are always checked at hygiene appointments to make sure the sealant material is intact.