After doing root canal treatment for 3 times, the pain may be due to the lack of thorough treatment, residual pulp or leftover root canals. Generally in the root canal treatment process will stimulate the apical tissues, may lead to apical tissue leakage problems, there is inflammation may also appear pain symptoms, this time you can choose some drugs to relieve the appropriate, but only after consulting the doctor to make the right choice. If there is any residual nerve or pulp, it is necessary to carry out root canal treatment in time in order to get a better treatment effect. Each patient’s tooth damage is not the same, in the process of root canal treatment, the way to do treatment will also have some difference, to find a professional doctor to carry out the relevant treatment in order to get relief, do not blindly treatment.