When the ball flies too far, too high, or won't spin correctly, it's time for new wedges. Also, be sure to clean your clubs between strikes. If you don't, the mud and grit will act like sandpaper on the grooves when you strike the ball again. Also, don't allow your wedges to air dry after cleaning them. The evaporating water will dull the grooves leading edge and you'll lose a little grip every time you do this. Your disposable razor is the same way.