If the matrix of the nail that lies deepest (the root). You can see it as the white half-moon produce the portion of nail that touches the nail bed. When this portion is damaged, it can produce scar tissue on the nail bed which can result in a ridge on the surface of the nail plate. Depending on the extent of the matrix damage, you may end up with a permanent ridge in that area; however, it will reduce somewhat in height as the nail bed heals.

If the root is completely destroyed, however, the damage is permanent and the nail can’t grow back. Did you consult with your doctor about the damage to your nails?