Tooth decay in 6-year-old children usually requires a filling. Tooth decay is tooth decay, when the decay is too deep, it can cause symptoms of pulpitis, and in severe cases, it can cause pulp necrosis, affecting the eruption of inherited permanent teeth, so it is necessary to fill the tooth in time. If the decayed tooth has not penetrated the pulp cavity, it is recommended to go to the hospital in time to remove the decayed material with instruments, and then fill the tooth with resin in time to restore the shape of the tooth, so as to prevent the caries from deepening. If the caries is serious and penetrates the pulp cavity, it will cause severe pain to external hot and cold stimuli and bite pain. In this case, root canal treatment is required before the upper layer of resin filling can be performed. If the caries is allowed to develop, the tooth germ will also affect the development of the permanent tooth germ if there is one underneath, resulting in abnormal tooth morphology or enamel defects. If the teeth are about to be replaced and have become loose and there is no toothache, they can be left untreated for the time being. Children with tooth decay need to be actively consulted and treated appropriately as prescribed by the doctor.