Are you just in your teens and already have gray hair? Here is some simple  tips for your grey hair to become black. 

Heat protection preventive measure against hair whitening. Excessive heat and sweat make the scalp dry. 
Use caps and umbrellas whenever you step out in the sun. Avoid hot water bath; and also, avoid direct heat from blowers that you use to pat your hair dry.  If you have already damaged your hair due to heat, apply cool hair packs to reverse the damage. The scalp gets moisturized with a regular use of such cool conditioner hair packs. Once the normal pH level of the scalp gets restored, white hair follicles wither away. It further promotes new hair growth.

Vitamin B12 maintains the scalp health and heals hair against whitening. Eat fresh fruits and vegetables rich in Vitamin B12 (yeast, cheese, avocados, oranges, plums and cranberry) to develop a healthy diet. 

Oiling is one of the best and natural ways to get rid of white hair. Use almond oil and olive oil to nourish your scalp.  

Stress is a powerful enemy that harms our skin, hair, and health.Meditation restores the chemical balance in our brain and leaves the body and mind calm. It prevents hair whitening and repairs the same.

Biotin is the natural ingredient that maintains black color in the hair. Thus, promote the consumption of biotin rich food items like oats and almonds, to get rid of white hair at a young age. The use of biotin rich hair cosmetics is also a wonderful mean to restore the natural black color of your hair.

Drink plenty of water, it is good for your hair as well as your skin