The grooves that form the chewing surfaces of the back teeth (molars) are extremely difficult to clean of bacteria and food. As the bacteria react with the food, acids form and break down the tooth enamel, causing cavities. Tooth sealants can protect these areas by sealing the grooves, preventing bacteria and food particles from accumulating. The sealants are made of a resin material that is applied to the back teeth, molars, premolars and any area prone to cavities. Sealants last for several years but needs to be checked during regular appointments.