Surface roots account for a very small fraction of a tree’s root system so grinding troublesome surface roots does not cause any harm to healthy trees. If a tree is already sick, diseased, or infested we would probably recommend a deep root feeding to nourish the tree at the time of the surface root grinding to prevent any adverse effects. Grinding surface roots actually prevents damage to utility lines, pipes, and electrical lines underground. It also prevents root damage to sidewalks, patios, slabs, and pools from roots lifting and cracking the concrete.