Random fact
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The hardest stuff in your body is part of your teeth, and is what is on the outside of the crown. It is called enamel. There are 3 other parts of the tooth - the dentin, which is softer than enamel and makes up most of the tooth, then the pulp (which has blood vessels and nerves, and is very soft), and lastly the root, which hold the tooth in place.
Human Body > The Mouth
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