Eating acidic food makes the teeth sore and sensitive. There are several reasons for this feeling: i. Due to the incorrect brushing method of the patient, the teeth are often brushed horizontally, resulting in the formation of wedge-shaped defects at the root of the teeth, which leads to the appearance of sensitive symptoms. In this case, it is recommended that patients go to the dentistry department for filling treatment in a timely manner, which can quickly relieve the symptoms of sensitivity. Second, due to heavy tooth wear, often consume too hard food, so that the teeth wear too much and there is enamel loss, so that the dentin exposed to appear sensitive. In this case, patients are advised to apply a desensitizing toothpaste to the sensitive area to relieve the symptoms of sensitivity.