Ice is generally not recommended for tooth pain, tooth pain only in the late stage of acute pulpitis ice can relieve the pain, for other causes of toothache ice has no effect, and often exacerbate the pain. Common spontaneous toothache is mostly due to pulpitis or apical periodontitis caused by chronic pulpitis or acute pulpitis early encounter hot and cold stimuli will intensify the pain, the duration of a longer period of time will be relieved, so the ice will only aggravate the pain. But when the pulpitis to the late stage, due to bacterial metabolites produce gas in the closed pulp cavity, will press the nerve to produce severe pain, at this time the ice can relieve the pain, because the ice so that the air in the pulp cavity contraction reduces the pressure, but the ice stops the pain will continue. As for the apical periodontitis tooth is often due to pulp necrosis and manifested as occlusal pain, this kind of tooth ice does not have any effect, so once the tooth pain is recommended to timely medical treatment, to take the formal means of root canal treatment to relieve pain, cure the affected tooth.