Root canal 2 times on the fourth day of knocking is still painful, consider that the nerve is not completely removed, infection, filling irritation, etc. The treatment mainly involves removing the nerve, treating the infection, and re-filling.
1. Nerve not completely removed: each tooth has 1~4 nerves, root canal treatment, mainly to kill the nerve, and then filling, if not completely kill the nerve will cause pain, you need to re-root canal treatment, the nerve will be completely removed.
2. Infection: Root canal treatment mainly targets diseases such as pulpitis, which requires drilling open the tooth to remove the decayed dentin. If it is not completely removed, and the infection still exists, it will also cause pain, and the infected pulp needs to be completely removed by re-treatment.
3. Filling stimulation: Root canal treatment requires filling, if the filling is not suitable, it will also cause stimulation pain, you can take out the filling and re-fill it.
Root canal 2 times the fourth day of knocking or pain may also be other reasons should be timely consultation, after the cause is clear, standardized treatment.