A tool for treatment of an ingrown toenail includes a tubular member having a length of about 1 2 cm and being tapered such that a diameter at a root is about 2 mm and a diameter at a tip is about 2 mm. Holes are distributed over the tubular member. The tubular member has a slit with saw-tooth edges and has a C-shaped cross section. A side edge of a nail plate is inserted into the slit and the saw-tooth edges secure the tubular member to the nail plate. A super elastic wire is inserted into one or more holes to fix the wire to the tubular member. An elastic force of the super elastic wire applied to the side edge of the nail plate is distributed substantially over a whole length of the side edge to correct the side edge into a flat shape.
