But it's not the jaw that fails... it's the teeth, or the tooth-jaw interface. N... | Hacker News

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		jstanley on Aug 1, 2017 \| parent \| context \| favorite \| on: Why Are Human Teeth So Messed Up? But it's not the jaw that fails... it's the teeth, or the tooth-jaw interface. Neither of which have any moving parts!

jessaustin on Aug 1, 2017 | [–]

Drill bits break much more often than drills themselves do.

PeterisP on Aug 1, 2017 | [–]

The tooth-food or tooth-tooth interaction "counts" as a moving part - it gets friction, it gets all kinds of forces/stress applied, exactly as the interaction between moving parts in a mechanism.

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