To get you started, every stump grinder model comes with either 6 free replacement teeth, or 3 replacement teeth and 1 extra tooth holder (depending on the model). With more teeth than the competition, you get smooth efficient operation and longer life. Even under heavy usage, a Baumalight designed cutting system means you will have less teeth to replace. Because the work is shared by more of our rugged teeth, they last longer and usually only require having to replace 2 or 3 at a time.