When a child’s milk tooth is rotten and empty due to tooth decay, according to the actual situation of the child, with the doctor’s advice, choose filling treatment, root canal treatment, extraction and other ways to alleviate the problem. 1. Filling: If the cavity of a child’s milk tooth due to tooth decay is relatively small, or the impact on daily chewing is relatively small, you can go to a regular dental hospital and choose composite resin, glass ionomer composite, etc., and treat it with local filling. 2. Root canal treatment: If the cavity of a child’s milk tooth is more serious, causing serious impact on the periodontal nerve and pain, root canal treatment can be carried out in time under the doctor’s advice to remove the foreign matter from the root canal and prevent further deterioration of the milk tooth. 3. Extraction: If the cavity caused by tooth decay is relatively large, which affects normal food chewing and loses the value of milk teeth, the milk teeth can be extracted under doctor’s advice. Children should pay attention to the protection of milk teeth in daily life, develop good eating habits and chewing habits, and have regular oral examination to avoid causing harm to milk teeth and affecting the normal eruption of permanent teeth.