Fissure sealing is now a clinically important and effective preventive method for fissure caries. The occlusal surfaces of teeth after eruption may have fissures of varying depths, and deeper fissures, in which bacteria, as well as food residues and metabolites, tend to pile up, lead to caries-prone causes. Therefore, many children’s molar teeth or six-year-old teeth are very susceptible to fissure caries on the occlusal surface. Fissure sealing can effectively prevent fissure caries by isolating the deep fissure from the oral environment, so that there is no way for food and bacteria to enter. Clinically, it is recommended to seal the sockets of molar teeth or newly erupted first and second molars to prevent fissure caries on the symphyseal surface.