“Fissures” refer to the pits and groves on the chewing surfaces of teeth. Often these fissures are so narrow that the bristles of a toothbrush or streams of water cannot clean them effectively. Fissure Sealants are usually applied to the back teeth in order to seal off the pits and groves from the oral environment and thus protect these fissures from bacteria and fermentable foods such sugar and starches. By applying Fissure Sealants it is possible to prevent decay from starting deep within the fissures. The sealant used is a colourless, protective liquid which is carefully painted on to the tooth surface before being hardened using an ultraviolet light. Applying Fissure Sealant is an extremely quick and straightforward procedure and takes only a few minutes per tooth.