Gray hair to black is more difficult, if you want to stop hair gray, you need to adjust the routine, maintain a good mood, pay attention to local hygiene of the head and adjust the diet structure. 1. You can adjust your routine, go to bed early, get up early, don’t stay up late, and ensure adequate sleep on the basis of appropriate physical exercise. 2. Cultivate hobbies after work and study to maintain a good mood. 3. Pay attention to the local care of the head, shampooing is not too frequent, keep your hair dry, you can moderately massage the scalp to promote blood circulation in the hair follicle area. 4. In terms of diet, try to eat more fresh fruits and vegetables, moderate intake of high protein content of nuts such as walnuts, eat less fried food and high fat content of animal offal. Can also be appropriate to supplement zinc. Medications need to be used under the guidance of a doctor, do not blindly use medication, so as not to cause adverse effects.