The less blades the razor has, the better is the razor at cutting, because it has a smaller contact surface (you can check beds of nails). This is good to shave the hair, but it is also better at cutting your skin.
A razor should have an optimal number of blades that I do not know how to calculate… But I am sure that, as some people already said, companies increase the number of blades as an excuse to increase the price of the razor.
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