Root canal sealing is mostly divided into two types: root canal disinfection and induction of apical formation, the former usually takes about 1 week and the latter takes from 1 to 3 months. 1. Root canal disinfection: It is an important step in root canal treatment, mainly assisting in root canal preparation and removing infected bacteria. It usually takes about 1 week. Depending on the drugs used, some drugs can be put into the root canal for 1 month, such as calcium hydroxide. 2. Induction of apical formation: For some young permanent teeth with incomplete apical development, it is necessary to use drugs to induce apical formation before root canal filling, usually about 1~3 months, and regular checkups, radiographs, and replacement of drugs. Root canal system is complex, it is recommended to go to the stomatology department of regular hospitals, and the physician will choose the treatment plan and medication according to the oral condition.