10 years old teeth are rotten and empty, mostly caused by caries, which is a manifestation of deep caries, i.e. the old people say worm teeth and tooth decay. It is necessary to make a specific analysis according to whether the 10-year-old child has already changed teeth or not, and it is suggested to promptly consult the regular dental hospital for detailed examination, and make individualized treatment plan according to the degree of caries development and the child’s personal physical condition, etc. 1.Unchanged teeth: Before changing teeth, the damaged big teeth are milk teeth, and the decayed tooth parenchyma of caries can be removed by the doctor. For the teeth that have been inflamed, root canal treatment can be performed, followed by filling and restoration to avoid affecting the development of surrounding teeth. If the affected tooth is already loose, it can be extracted. 10-year-old children are in the period of tooth replacement, and new teeth can be grown soon; 2. Replaced teeth: the replaced teeth belong to permanent teeth, and the crown condition should be observed. Live pulp preservation treatment or apical induction molding, etc., is required to remove inflammatory tissue from the root canal, control the infection and eliminate the inflammation, followed by filling treatment. If the affected tooth has caused most of the crown to be severely damaged and irreparable, complicated by periapical disease, such as chronic periodontitis and chronic gingivitis, resulting in extensive lesions around the root tip and significant loosening of the tooth, extraction treatment is required to avoid affecting the surrounding healthy teeth. After tooth extraction, denture treatment or gap retainer treatment can be performed to avoid displacement of surrounding teeth due to empty position of the affected tooth, which can lead to imbalance of bite and cause loosening and displacement of other teeth.