To make the white hair black first to find the reason for the hair to become white, some white hair can become black, some white hair can not become black: 1, due to long-term late night, mental stress caused by the black hair to become white, want to become black, to ensure sufficient sleep, usually eat more copper and iron content of food, such as spinach, black beans, black sesame, etc. 2, the scalp with vitiligo because of local melanin deficiency, the hair root can not be absorbed from the root of the hair follicle The actual fact is that you can find a lot of people who are not able to get a lot of money from the internet. In addition, the elderly due to the decline in body metabolic function, melanin synthesis reduced resulting in white hair, want to make it black, only through the black hair dye dye hair to make it black.