Root canal filling is the last step of root canal therapy, and it should be noted that: 1. After root canal filling, the initial setting time of temporary sealing is 2 hours, and it can be completely solidified after 24 hours, so you can't eat food after 2 hours of treatment and bite hard food with the affected side for 24 hours. 2. Within one week after treatment, there will be a little bit of biting pain and swelling pain, and it is normal to feel tooth elongation. After a week, the above symptoms will gradually improve until they disappear. 3. If the symptoms do not improve or worsen after more than two weeks, please see a doctor. 4. The teeth after root canal treatment are generally brittle, which will lead to tooth fracture when biting hard objects. It is suggested that crown restoration should be carried out after root canal treatment. If there is no crown cover, don't use this tooth to bite hard solid food, because if the tooth is fractured, it is generally impossible to keep the affected tooth and pull it out. 5. When the range of cavities is relatively large, fillings are generally easy to fall off. It is recommended to use crown sleeve to restore teeth. If there is no crown sleeve, don't bite too hard solid food, as mentioned in the above four items. Dr. Zhan