The purpose of caries treatment is to terminate the lesion process and restore the intrinsic form and function of the teeth. The main treatment methods are: i. Medication. Pharmacological treatment is based on wear caries, the application of drugs to inhibit the development of caries, applicable to permanent teeth have not yet formed cavities of shallow caries, shallow caries of anterior teeth, medium caries cavities; Second, filling surgery. For teeth that have substantial defects, filling is the most widely used and effective method, which is divided into two steps, firstly, removing carious tissues and weak dental tissues that have lost their support, and making the cavity into a reasonable state according to certain requirements. Then filling materials are used to fill the cavity to restore its form and function. The main materials are silver-mercury filling, glass ionomer filling and resin filling; Third, inlay. With metal or other materials and dental cavity in line with the restorations, set in the hole, called inlays.