When there is a black tongue, the black moss may be dyed moss or it may be caused by a lesion. The reasons for the sudden change of tongue moss are: First, recently ate some black food, such as mulberry, black drinks, etc., resulting in black tongue moss, this situation of black moss belongs to the temporary, no need to worry, also do not need to treat, after a day or two black moss will disappear; Second, if you have been using mouthwash recently, will also lead to black tongue moss, because mouthwash is a liquid to inhibit oral bacteria, when the oral bacteria reduce, the relative This situation should stop using mouthwash, the black moss will gradually become lighter; Third, a long time high dose of antibiotics will also appear the phenomenon of black moss, also because of oral flora dysbiosis, fungal overgrowth; Fourth, the gastrointestinal and other internal diseases, Chinese medicine believes that the tongue is dependent on the gastric gas, stomach diseases will cause the tongue moss The more serious the stomach disease is, the more obvious the moss phase of the tongue will be, and black moss generally indicates the occurrence of stomach tumors. In addition, the tongue moss not only shows the stomach disease, but also the 12 meridians endowed with qi in the stomach, so the lesions of each internal organ will cause the change of the tongue moss. If there is a sudden darkening of the tongue moss, one should carefully consider whether it is related to the recent diet, and after excluding the dyed moss, one should promptly go to the hospital for examination to clarify the cause.