I slapped an old 12 inch blade on my miter saw when sharpening my good one. I used it several days with no issues. Then when trimming a piece of oak about the size of a cigerette pack it, I had the piece flat on the table. The saw was out far enough for the blade to lift the edge of the board closest to me and flip it so it now rested vertically against the fence. My left hand held the piece flat on the table until the board flipped. Then my newly sore finger was pinched between the board and the fence. The board hit the fence so hard it split lengthwise and was thrown clear. My finger was black for 3 days and is still numb. The moral of the story is to use the recommended crosscut blade with a lot of teeth and to cut boards vertically when possible is probably a good idea.