One blade that is easy to replace (and loosen slightly) is *immensely* easier to rinse, which solves hair build up under the blade.
Multiple blades will tend to grab the hairs slightly and pull them, allowing the second blade to cut the pulled out hair, which then retracts back into the pores. This means the multiple blades will allow hair to be cut shorter while the blade itself is further from the skin (hence being theoretically safer), but at the sacrifice of each hair being pulled slightly and causing irritation.
Also, safety razor blades are much cheaper. I’ve seen cartridge razors going for $20 for a 5 pack, meanwhile most safety razor blade packs come in 20 blades for $5. This means there’s more freedom to replace the blade, which means a fresh one is used more often, which means a better shave (sharper/fresher blades mean more cutting of hair, less pulling of it).
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