White hair is caused by the gradual decrease or loss of vitality of melanocytes in hair follicles, but Fan Shi Wufafang has no ability to restore or activate these melanocytes.

The products claimed by Fan Shi Wufafang only temporarily dyed black hair, but did not really solve the problem of white hair. These products contain hair dyes or chemical components, which can only temporarily change hair color and cannot affect melanocytes in hair follicles.

White hair is a natural phenomenon related to age and heredity, which cannot be completely reversed by external products or treatments. Although some drugs or treatments can slow down the appearance of white hair, they can't completely eliminate it.