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Polishing doesn’t make a knife sharper; it just makes it smoother and gives it a mirror-like finish. The cutting ability of a knife depends mainly on the blade’s angle and sharpness. Polishing removes small imperfections and wear on the blade, making it easier to clean and maintain, but it doesn’t directly increase the sharpness of the blade. If you want to make a knife sharper, you would need to regrind or sharpen the blade to adjust its angle and sharpness.