Whether gray hair can become black hair needs to be judged according to the cause of the disease, if it is hereditary gray hair or aging caused by gray hair can not become white. If it is vitiligo that causes white hair, patients can grow white hair after treatment. 1. Hereditary gray hair: hereditary gray hair is mainly caused by genetic factors, the patient’s hair follicle melanin cells premature decline, so will appear gray hair at a young age, there is no treatment, so it can not become black hair. 2. Aging: If the patient is with the age of gray hair, also can not be treated. Because aging is the natural development process of the human body, it cannot be restored by other ways of treatment. 3. Vitiligo: Vitiligo can also lead to the symptoms of white hair, patients after regular treatment if the condition is stable, white hair can become black hair. The patient’s hair can become black can not be generalized, if the disease caused by the white hair, the patient should be timely medical treatment, in accordance with the doctor’s instructions to take specific treatment measures.