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<p>[QUOTE=&quot;Atv02, post: 535362, member: 17575&quot;]I&#039;m an engineer, and not to be rude, but without knowing what hardness scale you used, the numbers do not mean much to me. The enamel in a tooth has a Vickers Hardness number of 270 - 360. </p><p>&nbsp;</p><p>Pure copper, no alloy, has a Vickers hardness number of 369. - wikipedia</p><p>&nbsp;</p><p>Here are some more numbers from a different research on teeth. &quot;Craig and Peyton13 reported for enamel a hardness in the range from 344 ± 49 to 418 ± 60 VHN&quot;</p><p>&nbsp;</p><p>Tooth numbers are from the paper &quot;Microhardness and chemical composition of human tooth&quot;[/QUOTE]</p><p><br /></p>

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