The reasons for yellow tongue moss are as follows: 1, caused by poor oral hygiene, common in people who do not pay attention to oral hygiene, do not brush their teeth carefully, and do not regularly go to the hospital for ultrasonic dental cleaning. This group of people will have a lot of food residues and bacteria on the surface of the tongue and inside the mouth, which will lead to a yellow and thick tongue, accompanied by the symptoms of oral odor. In this case, you should brush and rinse your teeth carefully, and then clean all the surfaces of your teeth, including the food residues between your teeth. The patient can also use the toothbrush bristles to gently wipe the surface of the back of the tongue to relieve the symptoms of yellow tongue moss. 2, caused by food accumulation, commonly like to eat fried and barbecued food and other indigestible food, the patient itself suffers from gastric ulcer or indigestion and other diseases, long-term food accumulation led to yellow tongue moss.