Uneven grounds - do these wear out

Hi all. My Krups Type F203 retains large chunks of coffee bean even after prolonged grinding. The grounds are never uniformly ground. I read that the blades are blunt. So, sharpening them is not the solution, I suppose. Do these machines wear out over time and use? If so, what is it that wears out? When, if ever, do they need to be replaced? A bit confused. Thanks!

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