Sharpening with a whetstone is the best way to resharpen your Global knives. This traditional Japanese method of sharpening is a valuable skill to learn as it will ensure your knives remain razor-sharp like the day you purchased them. When sharpened correctly, you can get at least 6 to 8 months of general use without re-sharpening, which is much longer than a pull-through sharpener or traditional sharpening steel.