White tongue coating may be normal, or it may be a manifestation of superficial, cold, dampness or heat. Thin white moss and moist, can be normal tongue, or for the beginning of the superficial evidence, or the internal evidence of the disease is light, or Yang deficiency and internal cold. Thin white moss and slippery, mostly for external cold and dampness, or spleen and kidney yang deficiency, water and dampness. Thin white and dry moss, mostly caused by external wind-heat. Thick and greasy white moss, mostly due to internal stagnation of dampness and turbidity, or phlegm-drinking (pathological products formed by impaired metabolism of water and fluid), food accumulation (food indigestion and accumulation in the stomach). Thick and greasy white moss, the main phlegm and damp-heat internalization. White moss, like accumulated powder, is called “accumulated powder moss” if it is not dry when touched, which is common in plague or carbuncle, etc. It is made by the combination of foul and dampness with heat and toxicity. The moss is white, dry and cracked, rough as gravel, suggesting that dryness and heat injure fluid, yin fluid loss. After the discomfort should be timely medical treatment, in the physician’s evidence under the guidance of the choice of drug treatment, not self-medication, so as not to delay the condition.