The theory goes that there are two problems:
1. Knives don’t do great being wet and hot for extended periods of time. You’re supposed to wipe off the blade, use soap if necessary, then dry before putting away. Dishwashers leave the knives wet for hours, and that can cause rust over time. Also, if the knife has a wooden handle, hot steam can warp it and ruin the finish.
2. Dishwashers bang stuff around. If the knife blade is resting on something, the constant movement will dull the edge.
That said, if you have a medium-to-cheap knife with a plastic handle, and you sharpen it regularly, it’s probably fine. Or if you’re like my mom and buy a new knife set every year because the old one has become dull, it’s probably okay for you, too.
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