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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Worked alongside the research team for a razor manufacturer while I was at university for my industrial placement. As others have said edge edges are very, very fine and even when treated (DLC coatings and the like which you hear about) your stubble is basically tough enough to chip them.
One of the things they did was assess test razors on both internal and external shave panels looking at them under a microscope to assess damage and you can see the chipping under an optical microscope. Interestingly I always had a gut feeling razors went blunt on me very quickly, checking my razor damage showed I was wearing blades at twice the rate of anyone else …
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