I saw a video once of how a razor blade starts getting dull after just one shave. It doesn’t seem like it should be the case if it’s literally just cutting hair.
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The same reason a knife becomes dull “just by cutting a tomato”. A tomato is obviously less hard then the knife and so is hair. But the cutting edge is extremely fine – and repeatedly hitting something, even a softer material, will warp it, first at micro then at macro level. That will eventually wear out and deform the edge, which needs to be re-formed.
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