Every tooth has grooves and pits and these are called fissures. Fissures are on the chewing surface of the teeth and some tend to be deep and narrow and become difficult to clean effectively with toothbrush bristles. These deep fissures can harbour bacteria and result in tooth decay.
Sealants are used to fill these fissures to make the tooth smoother and less grooved therefore limiting food collection and decreasing the chances of decay. A tooth can be fissure sealed if it has not been filled previously and most commonly we recommend sealing newly erupted molars in children.