Eli5: Why do shaving razor blades become dull?

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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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Anonymous 0 Comments

So this is a trick I’ve been using for years that helps my blades last longer.

Get a cheap leather belt or a pair of crummy jeans from a good will store. I usually cut a square or two of Jean when I throw a pair out to use.

Before shaving or wetting the blade run the razor accross the back of the belt or the fabric, rub it against the grain I.e. the opposite direction you would shave with it. I often get 2-4 months out of a razor before I need to replace it. It’s not as good as the first time you use one but it keeps them from snagging all the time and I’m a daily shaver.

From what I understand it helps pull off little slivers/hairs of metal on the blade similar to why straight razors are run along a belt before using. However it works it definitely is worth a try.

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