At present, there is no clinical data to clarify how long it takes to fill a tooth after root canal filling. Due to individual differences, the decision should be made according to the individual’s recovery. 1. Root canal treatment has a certain trauma, it is not recommended to fill the tooth within a short period of time, it should wait until the localization is fully recovered without any abnormal reaction before filling the tooth. However, each patient’s recovery time is not certain, so the specific filling time is also different. 2. It is not suitable for filling if the local area is not fully recovered within a short period of time after root canal treatment, otherwise it will cause redness, swelling and pain of the gums, and will induce secondary infection. In the case of local edema is not completely eliminated for filling, will affect the tooth fixation, the tooth is easy to fall off or loosening, so it is not recommended to fill the tooth in a hurry. If the root canal treatment has been done, it is recommended to observe for a period of time and review regularly, and then choose the best time to fill the tooth with the doctor’s advice.