We’ve talked a lot on this blog about sharpening straight-edged knives, but we haven’t focused much on serrated blades. While we always encourage those with serrated knives to get them sharpened professionally or by the manufacturer, it is possible to sharpen one yourself. You just have to know what you’re doing.
For a straight-edged blade, you would take a sharpening stone and simply run the knife across it, but doing that with a serrated knife will only grind off the serrations. This might give the blade a specious and temporary feeling of sharpness, but it’s very bad for the blade and you should avoid it at all cost.
Instead, you will need a sharpening rod—either made from steel or ceramic. The size you get is really important, but it also depends on the size of the serrations. If you’re using a large cooking knife with wide serrations, opt for something like the DMT Ceramic Steel. For most pocket knives with small serrations, go for the DMT Diafold Serrated Sharpener. This works with made types of small serrations because the rod tapers down at the end, so it fits various sizes.