There is a possibility that there is a layer of tongue moss on the surface of the tongue, and normal people can see the pink tongue mucosa underneath through the thin layer of tongue moss, which is a normal phenomenon and does not need to be treated. Tongue moss and white and thick that oral local or digestive system problems, oral local mainly due to poor oral hygiene, the tongue has a lot of food debris, soft dirt and bacteria lead to tongue moss and white and thick. Digestive system diseases such as gastric ulcer, gastric insufficiency, reflux esophagitis, etc., can cause indigestion, resulting in food accumulation, gastric fire, resulting in white and thick tongue coating. A preference for greasy, indigestible foods and lack of exercise after meals can also cause a white, thick tongue. If the mouth is infected by Candida albicans, it can also cause white spots or white pseudomembranes to appear on the surface of the tongue.