Tooth pain when it is cold cannot be cured by itself, it needs to be cured by doctor’s examination to clarify the specific causes that lead to the onset of the disease and to carry out targeted treatment. The symptom of tooth pain when it is cold may be caused by tooth decay. When the early stage of decay destroys to the enamel, the tooth does not feel obvious, but if it goes further to the dentin layer, due to the proximity to the dental nerve, the symptom of pain from hot and cold stimulation will appear, or the symptom of pain from eating, then the filling treatment of the tooth is needed to isolate the external stimulation. There is also a case of dentin hypersensitivity caused by physiological or pathological abrasion of the enamel, which requires desensitization treatment. It is recommended to go to a professional dental hospital for examination to see if there is any decay or abrasion defect. Patients should pay attention not to eat too cold food, such as cold drinks or ice cream; they should also avoid eating too hot food or alternating hot and cold food, which can also irritate the teeth.