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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Whenever two materials contact each other, there will always be a tiny but that wears off. Even something like dripping water will erode away stone. It just takes a lot of time.
The only way to slow this is to use materials that are very hard.
Now you might think steel is very hard, but with a very sharp blade, that cutting edge is actually quite thin. That makes is not so tough actually, so the contact it makes with hairs will start to dull it right away.
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