Iron, key to strong beaver tooth

Down to Earth - - SCIENCE - B E AV E R S D O

not brush yet their front teeth are strong enough to cut trees. This is be­cause their teeth con­tain small amounts of iron that pro­tect the enamel from wear and tear and acidic sub­stance. Iron is present in an un­struc­tured phase around the well-or­dered "nanowires" that form the enamel's core. The find can be used in stud­ies on tooth de­cay in hu­mans. Science, Fe­bru­ary 13

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