We don’t recommend it, and here’s why. Slice uses 100 percent zirconium oxide, an advanced ceramic, for its blades. This extremely hard material must be hand ground on diamond sharpening wheels to create our proprietary cutting edge. The only way to grind our blades is with a diamond sharpening wheel, and even then, you won’t be able to mimic our patent-pending safety grind. The good news is that our blades last up to 11 times longer than steel blades, so it’s unlikely that you’ll need to sharpen them any time soon.