Dry mouth is mostly due to yin deficiency and body fluid, or qi and yang deficiency, and body fluid can't bear it. Those who have yang deficiency and body fluid should nourish yin and promote fluid production, and use Liuwei Dihuang Pill, Zengye Decoction and Wuzhi Drink. Qi and yang deficiency, Qiwei Baizhu Powder, Xiaojianzhong Decoction, Jinkui Shenqi Pill, etc. , and pay attention to check whether it is diabetes. In addition, it should be noted that snoring during sleep, shortness of breath caused by lung diseases, or rhinitis, and breathing with your mouth open may all lead to it.