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A human has around 20 primary teeth and 32 permanent teeth. They have many different functions, including chewing and biting. They are also important for our looks, for speaking and for singing. The enamel on our teeth is the hardest substance in the body. It is almost entirely made up of crystalline calcium phosphates.
Answer time 0s (0s). 26% have previously answered correct on this question. The question was created 2008-07-04.
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