The following materials are better for filling; 1, when the anterior tooth decay occurs, the decayed material can be removed and the composite resin with strong adhesive can be used for filling after preserving the tooth tissue as much as possible. The composite resin does not have high requirements on cavity preparation, and it is close to the color of natural teeth, so it can achieve good aesthetic effect; 2, the posterior area can be repaired with silver amalgam after perfect cavity preparation, and the silver amalgam will be completely cured after forty-eight hours, with the highest wear resistance and can be used for more than ten years; 3, it is better to use glass ion cement when filling the adjacent cavity, which can avoid the formation of overhang and prevent stimulate the gum and form inflammation. Glass ion cement is suitable for filling the root surface caries which is difficult to isolate moisture, and it can be used as the bedding material. Due to the ability of glass ionomer cement to release fluoride ions, it can prevent the occurrence of secondary caries.