The main causes of white and yellow tongue moss are poor oral hygiene and strong stomach fire, as follows: 1, poor oral hygiene: such patients have a lot of food residues and bacteria on the surface of the tongue, which leads to white and yellow tongue moss, and can even have obvious bad breath symptoms. In response to the above phenomenon, dental scaling treatment should be carried out in a timely manner, and the teeth should be carefully brushed and rinsed, and the tongue surface can be gently brushed with bristles during daily brushing. 2, Stomach fire: often due to incorrect diet structure, such as like to eat greasy, sweet and thick indigestible food, or often eat late night snacks, eat too much, and do not do exercise after eating, resulting in long-term accumulation of food in the stomach, causing indigestion, will lead to white tongue coating and thick The tongue coating is white and thick, and there is a sour taste in the mouth. For such patients, it is recommended to eat a light diet and drink more water and exercise.