Four-year-old children with broken teeth can be treated as follows: 1, due to the thin enamel of the premolar teeth, once the formation of caries, it will mostly affect the aesthetics and pronunciation, and resin veneers can be applied to restore the anatomical form. If necessary, after removing the net decay, resin full crowns can be made to improve the degree of aesthetics.2. Poor adjacency of the premolar teeth, which is prone to neighboring caries, can be filled by applying glass ionomer cementum or composite resin, etc., and pay attention to removing the excess material to prevent the formation of overhanging protrusions.3. When deep caries of the molar teeth cause pulpitis or apical periodontitis, the infected pulp needs to be removed, and the root canals should be closed by using calcium hydroxide paste, and the cavities can be filled with silver amalgam. The cavity should be filled with silver amalgam. If the crown of the tooth is missing for a large area, it can be restored by making a metal pre-formed crown.