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More teeth per inch is what you want, though some of it depends on the saw. There are blades available that have no tooth set, that also helps with a smooth cut....both criteria make the saw cut more slowly, and you may even break a blade. If the saw has orbital action, it may cut a little cleaner (this is all in reference to the jig saw). Don't go for the metal cutting blades, the packages should have a description of the material the blade is made for. Cut with the work piece face down, that will give the face side the smoothest cut.
