There is a thin layer of white moist tongue coating on the back of normal people's tongue, which is called tongue coating. From exfoliated keratinocytes. Saliva, bacteria, food scraps and oozing white blood cells.
Under normal circumstances, due to chewing and swallowing, as well as saliva and diet washing, the substances on the surface of the tongue are often removed, leaving only a thin layer of white tongue coating.
When sick, eating less or only soft food reduces chewing and tongue movement, or saliva secretion decreases and tongue coating thickens. The tongue coating of normal people is generally thin, evenly distributed on the tongue surface, and slightly thicker in the middle and root of the tongue surface.
Extended data:
Frequent scraping of tongue coating will stimulate taste buds, damage tongue nipples, cause numbness of tongue back, decrease taste and appetite, and then affect health. Moreover, it is conceivable that scraping tongue coating is a temporary solution, not a permanent cure.
In order to maintain oral hygiene, some simple methods can be used to clean the tongue surface. Including gently brushing the tongue surface with a special soft brush. If you can't buy a special soft brush, you can use a toothbrush, but you must not use too much force. You can also rinse your mouth with salt water and mouthwash, or rinse the root of your tongue with a tooth washer. Remember not to scrape the tongue coating with hard plates and sharp things.
Baidu Encyclopedia-Tongue (Human Organ)