The lack of trace elements in the body is also a cause of gray hair. By eating underground tubers, such as Polygonum multiflorum Thunb, cooked sweet potato, potato, taro, etc., a large number of trace elements can be absorbed from them to stimulate hair roots and grow black hair. At present, dermatology, psychiatry and family medicine are recommended for the treatment of white hair. Besides, you can try to change your diet and lifestyle: 1. Don't be partial to food, eat more foods rich in vitamins and minerals, such as kelp, vegetables and black sesame seeds. 2. Learning how to relieve emotions, such as singing a song, shouting in an empty place, and finding a "trash can" to pour out, are all good methods. 3. When using hair dye, you should read the instructions carefully and observe the precautions (such as wearing gloves before dyeing your hair and not dyeing your hair within 48 hours after perm). 4. It is best to dye your hair one to two months apart to avoid dyeing your hair during menstruation and pregnancy. 5. Eat less artificially added food, such as instant noodles, candied fruit or pickled products. 6. homemade black hair medicated diet: Polygonum multiflorum porridge: Polygonum multiflorum 50 grams. Boil in water and then remove the residue. Add a cup of white rice and a proper amount of rock sugar and red dates to cook porridge. Yam sesame paste: Dice the yam, and then boil it with black sesame powder and rock sugar into a thick paste, which can be eaten.

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