Drinking hot milk has no effect on toothache and cannot relieve it. There are many reasons for toothache, most of them are the reaction of the nerve caused by dental caries, after dental caries, the nerve is very sensitive to external stimulation of hot, cold, sour and sweet. After tooth decay, the nerve is very sensitive to external stimuli such as hot, cold, sour and sweet. Remove the bacterial infected tooth tissue at the early stage of tooth decay and use dental filling materials to isolate the external stimuli, and the toothache can be relieved. Pulpitis is a serious symptom of infection of the nerve of the tooth, with severe toothache and sometimes sleeping pain at night. Root canal treatment is needed and drinking hot milk has no effect and does not relieve toothache. Toothache can also be caused by gingivitis or periodontitis or trigeminal neuralgia. But these causes of toothache, drink hot milk have no obvious effect, it is recommended to go to the stomatology department for medical treatment.