The most effective treatment for inflammation and pain in the root canal of a tooth is root canal therapy, which involves killing the nerve of the tooth completely with medication, then pounding the nerve in the root canal with a special oral frustration and dilatation, then flushing out the nerve with a liquid, and then flushing out the infected material as well. After the root canal is completely prepared and free of any infection, it can be filled with hot cement, which can completely close the root canal and prevent bacteria or food from infecting the root canal and complicating periapical periodontitis. Therefore, once a patient has a toothache, it is important to go to the dentist in time for standardized root canal treatment.