Root canal treatment sealing plaster fell off may need to observe and follow up on time, re-plug a piece of temporary sealing material, do root canal filling, etc. It is recommended to go to the hospital for specific examination and disposal. 1. The main purpose of the sealing plaster is to seal the medication in the root canal and play a sealing role on the surface of the tooth. If the plaster is partially dislodged and the remaining sealing material is relatively large, it can play a sealing role, so it is possible to observe and follow up on time, and pay attention to not eating with the affected side. 2. If the plaster of the sealing medicine is all dislodged in a short period of time, it is necessary to go to the hospital for timely consultation. If the time is short, it can directly seal the medicine again and plug a piece of temporary sealing plaster, and if the exposure time is long, it is necessary to re-flush the sealing medicine of the root canal and seal the plaster again. 3. If the root canal is dislodged around the time of follow-up, you can do root canal filling directly.