A cavity in the incisor can be filled. The decay of incisors is usually related to the decay of adjacent surfaces caused by food impaction, and the cavity can be accessed from the lingual side, grinding away the decayed tooth tissues, preserving as much as possible the healthy structure of the tooth, and using composite resin similar to the color of the tooth for filling, and the cavity close to the pulp must be filled with calcium hydroxide to protect the pulp. If the X-ray shows that the pulp has been exposed and the tooth is sensitive and painful to cold, heat, acid, and sweet, the pulp needs to be removed under local anesthesia, root canal preparation, rinsing, disinfection, and completion of root canal filling before repairing the cavity. In order to prevent discoloration and fracture of the tooth, it is best to make a porcelain or all-ceramic crown restoration.