If you want to prevent your knives from becoming dull, it’s important to always maintain them by cleaning them once you’re done cutting. Not putting them in the dishwasher also helps. Lastly, avoid cutting or using your knives on metal surfaces, like stainless steel. Using it on these surfaces is a recipe for dulling your knives very quickly. Anyway, you will have to sharpen it from time to time. One way to do this is by using sharpening steel, which sometimes can come with a knife set.