Six-year-old children with dental caries should have oral examination and make treatment plan after taking whole-mouth surface tomography film, as follows: 1.If the caries cavity of the baby tooth is shallow, it can be filled with composite resin after removing the decaying matter. If the cavity of the baby tooth is shallow, it can be filled with composite resin after removing the decayed material. If the baby tooth has a large area of caries, or forms pulpitis or periapical inflammation, the pulp can be removed, the root canal can be closed with iodoform paste, and the metal preformed crown can be made. 2. Fill the root canal and complete the apical induction molding. Pay attention to regular observation, and once the root development is complete, the tooth can be replaced with an amalgam tip for permanent filling.