Good quality Serrated bread knives are made of high carbon steel and should not dull quickly. In general – if used for its correct purpose – the bread knife shouldn't dull at all. But if cutting other ingredients or using the knife wrong on the cutting board – the blade can wear off. If your bread knife needs sharpening, you can do it with a round steel honing. Remember to slide the knife gently, with long moves, while focusing on each serration separately.