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If your knives are very dull, it may be best to take them to a professional knife sharpener. But for everyday use, several swipes with a straightening steel, sharpening stone or other knife sharpener will restore the edge to your knives.
Before each use, hold the knife to a steel or ceramic rod at a 20-degree angle and lightly draw the knife across its surface two or three times.
To use a stone, place a drop of mineral oil on the coarse side and draw the knife across the surface two or three times at a 10- to 20-degree angle. Repeat, using the finer side of the stone.