Tongue moss is a layer of moss and scale on the surface of the tongue. Normal tongue moss is thin and white in appearance, with a moderate dryness and wetness, and can be self-checked by the texture, color and shape of the tongue in daily life. The normal tongue is thicker in the morning and becomes thinner after eating or brushing your teeth in the morning. Sometimes poor oral hygiene or smoking and Candida albicans infection can make the tongue thicker. The normal tongue is white and lubricated and can become stained if colored foods are consumed. Sometimes the filamentous papillae are overly elongated to form hair-like changes, which are more likely to accumulate microorganisms causing dysbiosis. Care should be taken to keep the oral cavity and tongue mucosa clean and seek consultation from an oral mucosa doctor or Chinese medicine practitioner. The shape of tongue moss includes whole moss and partial moss, etc. If the moss is distributed on the whole tongue, it is called whole moss, and if it is distributed partially, it is called partial moss. When there are irregular areas of missing tongue moss on the back surface of the tongue, accompanied by atrophy of the tongue papillae, so that the normal tongue mucosa and smooth areas without tongue moss are distributed in a map-like manner, it is called map tongue, some poor gastrointestinal function or mental anxiety and tension will appear map tongue, there is no need to worry at this time, we should pay attention to the regulation of rest and diet, and maintain good oral hygiene, usually do not need drug treatment. So the normal tongue moss is white, moist cover the whole tongue of the whole moss.