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There is no evidence that pulling out a grey hair will cause more grey hair to grow. You may remove grey hair if only a few are there. If there are many on your scalp
you may apply hair colour to your hair. Eat plenty of fresh fruits and green leafy vegetables as they contain antioxidants
to prevent hair and skin damage. Drink plenty of water. Grey hair does not spread by touching or anything like that. It is usually genetics which decide the distribution and age of appearance.