If you have toothache symptoms after root canal treatment, the pain will usually disappear in about 2~3 days for mild cases, but if the pain is more serious or combined with inflammation and infection, it will take longer time. If there is only a mild toothache after root canal treatment, and there is no infection or inflammation, the pain will usually disappear gradually in about 2~3 days, and no special treatment is needed. The pain will be aggravated if the degree of toothache after root canal treatment is more serious, or if the pulp is infected secondary to the lack of attention to oral hygiene after the procedure. In this case, the pain will last longer, and if necessary, you need to take oral painkillers to reduce the degree of pain, such as aspirin, ibuprofen, etc. Generally, you can achieve the purpose of pain relief within a short period of time after using the medication, but the specific time varies from person to person, and you need to re-treat the root canal. If the toothache persists after root canal treatment, it is important to go to the hospital in time to clarify the cause of the toothache and follow the doctor’s instructions.