Enamel is the hardest tissue in our bodies, made almost entirely of calcium, phosphorus and other minerals. It protects our teeth when we chew and shields them from pain when encountering things that are very cold or very hot.
The enamel that covers your teeth originated in an unlikely place: on the scales of ancient fish. Scientists say they figured this out by examining the fossils of long-dead fish, as well as the DNA of a range of creatures alive today.
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