Astringent tongue should pay attention to the following conditions: First, oral factors: poor oral hygiene, many gingivitis, periodontitis, tartar, mouth ulcers, pharyngitis and other factors can lead to the occurrence of astringent tongue. Second, the digestive system factors: such as gastrointestinal peristalsis slowdown, indigestion, etc., thus causing the performance of astringent tongue. Third, endocrine factors: endocrine disorders, abnormal hormone metabolism may also lead to astringent tongue. Fourth, atrophic linguitis, radioactive stomatitis, tongue papilla atrophy, dry mouth, burning mouth syndrome may lead to astringent tongue. Fifth, other factors: astringent tongue is associated with ischemia or neurological, which causes numbness and astringency of the tongue due to ischemia.