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.
In: 254
It’s because the blade edge is so fine. Yes they’re made of metal, but when the metal edge is [microscopically thin](https://i.dailymail.co.uk/1s/2020/08/07/09/31669388-8600793-image-a-38_1596787839546.jpg), then even something like hair can dent it after lopping through a few thousand (1 shave).
Check this out they even have microscope-video of a blade in action:
[https://www.npr.org/2020/08/06/898577234/cutting-edge-research-shows-how-hair-dulls-razor-blades](https://www.npr.org/2020/08/06/898577234/cutting-edge-research-shows-how-hair-dulls-razor-blades)
https://www.dailymail.co.uk/sciencetech/article-8600793/Human-hair-chips-away-razors-edge-engineers-say.html
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