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Interesting article! However I hoped to get some recommendations, or at least “it doesn’t matter what you buy”, and maybe some comments on the performance of multi-blade razors.

Given that the angle of cut matters is it better to shave certain parts of the face with the grain or against?

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I prefer to use double edge safety razors and shaving with the grain. It prevents ingrown hairs, but the result is slightly less smooth. It's enough for daily use and very comfortable while shaving. Replacing blades is super cheap so it's always sharp.

always against, so that blade approaches hair as close to 90 degrees as possible, cuts quickly and is done.

what really kills the blade and creates cracks is when you cut hair at 15-20 degrees and blade cuts hair and then starts dragging it along your face while cutting and this is how microcracks form and grow in size.

you can create your own experiment with knife and some veggie like green onion. try to cut it at steep angle and drag it along the cutting board - and you will see that it produces much more stress on cutting surface

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