The patient’s tongue is astringent, may be due to poor oral hygiene or endocrine factors, as follows: 1, poor oral hygiene: if the oral cavity such as infection, as well as gingivitis, periodontitis, or a large number of tartar, may lead to astringent tongue, some of the manifestations of the pain. 2, endocrine factors: oral flora imbalance, poor secretion of the salivary glands, can also cause some of the manifestations of the astringency of the tongue. 3, other Factors: to see whether the tongue astringent combined with other abnormalities, if the combination of odor, the main consideration of oral hygiene is more likely, including poor diet, smoking, drinking, staying up all night, overeating and so on. If the symptoms are combined with bitter mouth, it is necessary to consider whether there is bile reflux, gastrointestinal digestive dysfunction and so on. If the symptoms are combined with numbness of the tongue, it is necessary to pay attention to whether there is any blood circulation problem, and check the blood sugar, blood pressure, blood lipid, blood viscosity and so on.