Bite Realigement  (Incisor  Reduction) - The theory is, that the horse being fed processed food (Hay and Grain) verses pasture, wil cause excess wear to the Molars and not enough wear to the Incisors.  This causes the Incisors to be too long.  So to remedy this, the Incisors need to be shortened or reduced.  Two things are constant in a horses mouth; First -  the teeth erupt at the same rate that they wear, so if they are not wearing they are not erupting,  Second - an onopposed tooth (the opposing tooth top or bottom is missing) will super erupt. In other  words, if a horse is missing a tooth, the tooth opposite it will get longer and longer.  So, if  the Molars were getting excess wear they would supererupt, but  IF the Molars were to short, they would not be in contact, or occlusion, so they would not get sharp edges so they wouldn't need floating.