Many people in our daily lives feel toothache when biting hard objects, or when we eat something too cold, too hot or too sour, our teeth will also feel severe pain. This phenomenon is usually referred to as dentin hypersensitivity. Dentin hypersensitivity can also be called hypersensitive dentin. It is a common disease, more common in men and women over middle age, with more male patients than female. It refers to the sensitivity of exposed dentin to temperature, chemical and mechanical stimuli, mainly manifested as tooth soreness. In this case, at the beginning of the pain, we can use some small methods, such as cutting garlic into small pieces and placing it on the painful tooth, which can play an anti-inflammatory and bactericidal role, significantly reducing the pain. In addition, we can also chew tea leaves on the affected tooth. The tea does not have to be fresh; the leftover tea leaves after drinking tea water can be used, which can make full use of the old tea leaves. Moreover, tea contains abundant fluoride and tea polyphenols, which can not only effectively disinfect and kill bacteria, but also prevent cavities. Of course, there is a simple method for dentin hypersensitivity, which is to often use desensitizing toothpaste. However, if using desensitizing toothpaste, we must adhere to it for a period of time before feeling its effect. Dentin hypersensitivity is a normal physiological response, a signal that our health is under threat. When our teeth become sore, we will easily realize that our teeth are sick and should go to the hospital for examination and treatment. If the sensitivity of the teeth is too high, it may lead to other lesions.