Scalp massage has a good effect on promoting blood circulation, thus moistening hair and turning white hair black again. Before going to bed every day and after getting up the next day, massage the scalp with both hands and fingers, from the forehead to the pillow for 2-4 minutes each time, 30-40 times per minute, and then gradually extend it to 5- 10 minutes each time. As long as you persist for a long time, you can have black hair.