There are two main causes of thick white tongue: First, the long-term poor oral hygiene environment caused by. Second, caused by body fire. When people do not brush and rinse their teeth carefully for a long time, so that the tongue and teeth surface accumulate a lot of food residues and bacteria, the tongue will be white and thick, and at the same time the mouth odor, such people are also very easy to suffer from gingivitis and periodontitis, resulting in the phenomenon of red and swollen gums, bleeding. When a person’s body is on fire, it will also lead to a thick white tongue, and accompanied by bad breath, commonly in people with strong stomach fire, strong stomach fire is due to a long time like to eat greasy, indigestible food, this kind of sweet thick food will make poor digestion, causing food to stay in the stomach for too long, resulting in strong stomach fire, when the stomach fire rises to the mouth will cause a thick white tongue, and a sour taste in the mouth. In addition, people with strong liver fire will also have the symptom of thick white tongue coating, mainly seen in long-term anxiety, tension, sulking, depression or irritable people.