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Yes, just make sure they're clean. Any dirt or any dried food or whatever that you might have on them will ding up the edge of a razor.

It's not required every shave, but the edge will be better if you do strop, and you have a good quality stropping medium.

Sometimes I don't do it, either, but usually I do.

I usually keep a...

It definitely makes a difference. You can literally see the change in the edge if you have good eyesight, and you could see it with a loupe if you didn't.

One only needs to shave their arm in...