Cleaning the tongue is generally unnecessary. Tongue coating is a response to the body’s stomach qi and health condition. Excessive cleaning of the tongue will lead to damage to the tongue, which can easily lead to symptoms such as loss of taste and dry mouth. The thinness, thickness and color of the tongue coating are helpful in Chinese medicine diagnosis. Thin white tongue coating is a normal physiological condition, indicating that the stomach qi is good. However, if the tongue coating is thick, it means that there is heavy dampness in the body. If the color of the tongue moss is yellowish, while the overall color of the tongue is darker, it means that there is internal heat in the body. However, if the patient has no tongue coating, there may be a lack of yin in the body or the stomach qi is failing. Do not overdo it, if there is an abnormality in the tongue coating, you should consult a doctor immediately and standardize the treatment under the guidance of the doctor.