Yes, when it gets blunt. You'll be able to use your log splitter for a while before the wedge becomes blunt and needs sharpening. How long before you have a blunt wedge depends on how much log splitting you do, so it will vary from person to person. The most important thing is to observe the wedge regularly for signs of bluntness and then take the necessary action to sharpen it. A combination of a coarse metal file and a fine metal file will do the trick. Using the coarse metal file, begin by evening out any imperfections on each side of the wedge. Then slowly smooth the edges on each side to begin the sharpening process. Finish with the fine metal file, taking care to file the entire length of the wedge an equal number of times on both sides.