
It is said that you should not put paring knives, paring knives and general kitchen knives in the dishwasher to avoid the blade becoming dull and matt.
But this claim dates back to grandmother's times, because nowadays kitchen knives are usually made dishwasher safe.
In the past, most kitchen knives or paring knives had wooden handles, which absorb water and easily lose their shape due to the temperature in the dishwasher. Wooden kitchen utensils should generally be washed by hand and dried thoroughly to make them last longer. Modern knives have plastic or steel handles that do not break in the dishwasher.
Likewise, knives used to be made of carbon steel because it is easy to shape and costs relatively little. You can't put carbon steel in the dishwasher because it rusts quickly. Nowadays, almost all kitchen knives are made of stainless steel, which is extremely resistant to oxidation and matting.
Stainless steel is dishwasher safe.
Knives with ceramic blades undoubtedly cut best, but are too fragile to wash in the dishwasher.
