Cold water for toothache does not necessarily work. Cold water for pain relief is mainly for acute pulpitis, pain caused by filling the pulp chamber with blood, containing cold water is somewhat effective. For patients who are extra sensitive to hot and cold, cold water will stimulate the tooth to become more painful. Especially for patients with periapical inflammation, the patients themselves are afraid to bite, so containing cold water will not have any pain-relieving effect. No matter what kind of toothache, you need to go to the hospital for root canal treatment in time. Containing cold water can only provide temporary pain relief, especially for patients with acute pulpitis, once the cold water is spit out, the toothache will be very obvious immediately. Therefore, it is recommended that patients should undergo timely treatment to avoid further aggravation of tooth inflammation and finally extraction of the tooth.