Asked for male, 21 years old from Hyderabad
White hair are mainly due to hereditary factors. The first thing I would like to clear is there is no cure for white hair, you can only prevent them. If you want I will prescribe the medication
the only way to convert your white hair into black is by colour them. Use a colour which is free from ppd rather than ammonia because ppd is the main culprit for hair colour related allergies not ammonia.