Except for shallow caries which can be treated with medication, most of them need to be treated with restoration and filling. Caries mostly occurs on the chewing surfaces of the molars, and the early damage is usually in the outer layer of the dentin, if not treated in time, it will gradually reach the pulp, which can cause complications such as tooth abscess. The purpose of caries treatment is to prevent the progression of caries and restore the intrinsic form and function of the teeth. For a small number of shallow caries (limited to enamel) permanent teeth that have not yet become cavities, sodium fluoride and silver nitrate are given to inhibit the development of caries, and most of them need to be filled (amalgam filling, composite resin filling, acid etching photosensitive composite resin filling), inlays or crowns according to the extent and volume of the tooth defects, in order to restore the form and function of the tooth. After the occurrence of dental caries, it is necessary to give treatment or protect the teeth under the guidance of a dentist, and not to use medication by oneself.