Elderly gray hair is not easy to become black hair. Elderly gray hair is generally no need for treatment, there is no effective cure, because the elderly gray hair is a physiological phenomenon, if you must gray hair into black hair, then we must consider hair coloring, but the hair dye allergic to the crowd is not recommended to dye hair. Hair dyeing makes gray hair black, which is temporary, time is not long, gray hair will grow out. There are many reasons why pathologically black hair turns gray, usually caused by a decrease in the number of melanocytes, and other reasons such as malnutrition, mental trauma, sadness and depression can be the cause of gray hair. In order to postpone graying to blacking you have to stay away from these bad triggers. Elderly gray hair is not easy to become black hair, if the related discomfort symptoms, it is recommended to consult a doctor in a timely manner, under the guidance of a professional physician’s identification of the treatment should not be self-treatment, so as not to delay the condition.