Dry mouth and tongue at night belongs to the category of “fluid deficiency syndrome” in Chinese medicine, which is commonly treated with medicines such as Nourishing Yin and Clearing Lung Pills (to get rid of lung heat by nourishing the fluid in the lungs) and Zuo Gui Pills. 1. Nourishing Yin and Clearing the Lung Pill: Containing Chinese medicines such as Dihuang, Maidong, Xuan Shen, etc., it has the effect of nourishing Yin and moistening the lungs, clearing heat and facilitating the pharynx, and can be used to improve or treat Yin deficiency and lung dryness (the deficiency of Yin in the human body leads to dryness of the lungs not being nourished), dry and painful pharynx and cough with little phlegm, and also improve the problem of dryness of the mouth and tongue at night. During the period of taking the medicine, if the fever temperature exceeds 38.5 ℃, or wheezing (shortness of breath) shortness of breath, or cough aggravation, phlegm volume increased significantly should go to the hospital. 2. Zuo Gui Wan: Containing Radix Rehmanniae Praeparata, Semen Cuscutae, Achyranthes Bidentatae and other traditional Chinese medicines, it has the effect of nourishing the kidney and replenishing yin, which is conducive to the improvement or treatment of yin deficiency, lumbar soreness and weakness of the knees, night sweating (sweating abnormally after falling asleep, but sweating stops after waking up), mental fatigue (lack of mental clarity), and dryness of mouth, and also improves the dryness of the mouth at night. For safety, this product is contraindicated for pregnant women, children are prohibited, and should not be taken by patients with colds. In addition, the drug occasionally see mild itching of the skin, after stopping the drug can disappear by itself. It should be noted that dry mouth at night may also be caused by low water intake and hot weather, which can generally be improved by drinking more water and reducing clothing. In addition, Chinese medicine emphasizes the use of evidence-based medicine, so do not self-medication, should be used under the guidance of a doctor.