Nails grow with the help of enjymes in our body.they are made of tough protien called keratin
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Nails are made up of a substance called keratin. Many people think that nails grow from the fingertip region but actually they grow from the roots near the skin. At the base of the nail the skin is really very thin. There is half moon shaped whitish region in the nail called lunula which contains keratin. This keratin merges with the nail plate and pushes the entire nail up.