Lawn mower blade
My lawn mower is about three years old, and the blade has never been replaced. Recently, the grass after mowing has become uneven, with ragged tips, although the blade itself doesn't appear to be significantly damaged.
How do I know if it's time to buy a new blade or just sharpen it?

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Torn grass tips are a sure sign that the blade is no longer cutting the stems, but simply tearing them. Three years without maintenance is a significant period, as the basic maintenance schedule recommends sharpening the blade every 20–25 hours of use. A wide selection of proven spare parts and cutting elements for various brands is available in the mower blades for sale catalog on the UDC Parts website. When purchasing a new blade, it's important to accurately check the length, deck size, diameter, and shape of the center bore.