The image on the left shows the excessive removal of material from the grinding surfaces of the teeth. In this example 30 percent of the grinding surface has been wrongly removed and of the lower molars about 50 percent. Thus the horse loses about 40 percent of its chewing efficiency. If the first molar (2nd premolar) in the mouth is completely smoothened as some people do, the horse will have lost 50 percent of its chewing ability.
The correct removal of sharp edges is shown in the illustration on the right. A very minor part of the chewing surface is affected by treatment and the teeth will not cause any injury to the cheeks or tongue.