The caries on the adjacent surface of the big teeth should be examined by a professional dentist to see the exact extent of the caries and to take partial dental film to see if the depth of the caries is adjacent to the pulp, and to remove all the caries as much as possible by using a dental high-speed turbine drill. Prepare the cavity with good resistance and retention, remove the thin-walled weak cusps during the preparation process, and check whether the cavity is near the pulp or exposed pulp. After the preparation of the cavity, the cavity is placed between the two teeth with the dental molding system, and then the cavity is filled with the special filling material, and the whole treatment is completed.