Tooth sensitivity refers to the soreness and pain triggered by cold, hot, sour, sweet stimuli and mechanical effects such as friction on the teeth. Although the pain caused by tooth sensitivity does not last long, it often interferes with the patient’s ability to eat, which is detrimental to the health of the body. Many people will experience soreness when eating sour, spicy, sweet, cold or hot foods. This is usually relieved within a few seconds of stopping eating, but is likely to recur if eaten again. Therefore, tooth sensitivity has a certain ability to heal itself. When the patient’s body is in a state of stress, such as women’s menstruation and late pregnancy or when the resistance is lowered, the sensitivity of the nerve endings will increase, so that the original stimulus that is not enough to cause pain, can also cause dentin hypersensitivity. Once the physical condition returns to normal, the sensitivity disappears. Tooth sensitivity is mainly due to enamel damage, periodontal disease, and dental caries. Since most of them are caused by dental diseases, it is important to go to a regular dental clinic in time for examination and treatment when severe discomfort occurs from tooth sensitivity.