If the teeth are blackened due to deficiency of kidney essence or yin deficiency and fire (deficiency of yin and essence in the body, resulting in hyperactive deficiency and fire), you can take Zuo Gui Pill and Zhi Bai Di Huang Pill to treat the problem. There are many reasons for the blackening of teeth, it is recommended to consult a doctor for examination, to clarify the cause of the disease, and then carry out targeted treatment. Zuo Gui Wan has the effect of nourishing the kidney and tonifying yin. It is used for lumbar soreness and knee weakness caused by true yin deficiency, night sweating (abnormal sweating after going to sleep and stopping sweating after waking up), fatigue (lack of spirit) and dry mouth. Contraindicated for pregnant women and forbidden for children. Zhi Bai Di Huang Wan (知柏地黄丸) has the effect of nourishing yin and lowering fire (nourishing yin essence and lowering fire). It is used for hot flashes (flashes of heat) and night sweating caused by excessive yin deficiency and fire, dry mouth and sore throat, tinnitus and spermatorrhea, and short and reddish urine (small amount of urine, dark yellow in color). If medication is needed, it should be diagnosed by a doctor and regulated according to the doctor’s prescription.