Traditional pizza cutters lose their sharpness overtime. Their thin blades tend to make the cutter vulnerable for damage and could dull the edges. Midnight Slice is designed to have a thick blade but sharp enough to last you forever. If you need to sharpen the Midnight Slice, we recommend removing the blade by removing the nut holding the blade. Then using a flat knife sharpening stone, take the blade and run it across the stone while the blade is positioned on an angle.