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Good nails make a good impression when you are in a conversation at close angles and in a good handshake. Nails are made of hardened protein called keratin and they serve to protect the finger tips and the tissues around them from injury. The beta keratins in the nails are related to alpha keratins that make up the hair. Healthy nails grow about 1/8 of an inch every month and are important for health of your fingers.