I learned my sharpening concepts from Alton Brown. Basically there are two kinds of dull. The first is that the blade is "sharp", but the edge is now wavy due to use. This can be resolved using the whet stones and sharpening rods. Basically, you are taking the waves out of the edge and getting it back to a straight line.
The second kind of dull is that the edge has been worn down flat. In this case, the whet stone or sharpening rod can not restore an edge and it must be professionally honed. This will remove steel from the blade and restore a sharp edge.
I don't know if this is true and that's all I have.
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