Fissure sealing, also known as fissure sealing, is the use of resin and other materials to fill the fissure to enhance the child’s ability to resist caries. Fissure sealing is a technique commonly used in dentistry, mainly for children at the developmental stage, under the operation of a professional doctor will be resin, glass ions and other materials with a sealing effect, filling the fissure part of the surface of the teeth, so as to avoid the emergence of food residues, plaque and other situations, so as to enhance the child’s resistance to caries and reduce the incidence of caries. However, fissure sealing can only be used as a means of prevention, if caries has already appeared, fissure sealing can not play any role, or need to be carried out under the guidance of the doctor’s resin filling surgery, endodontic treatment and so on. Fissure sealing is still effective in preventing dental caries, but whether it is necessary to follow the guidance of a professional doctor.