The self-adjusting tool (10) for correcting ingrown toenail uses self-adjusting elastic tension to lift the ingrown ends (N1, N2) of an ingrown toenail (N). In a first embodiment, the self-adjusting tool (10) includes two identical leaf springs (12a, 12b), each having a flat end (16a, 16b) and a band (14a, 14b) forming a flat loop at the opposite end. The two springs (12a, 12b) are interlocked by sliding the flat end (16a, 16b) of one spring through the band (14a, 14b) of the other, and the free ends (16a, 16b) are glued to lateral edges of the ingrown toenail (N) to flatten the toenail (N) by self-adjusting elastic tension. Other embodiments show at least one resilient member flexed across the ingrown toenail and anchored at opposite lateral edges on the ingrown toenail to pull the ingrown edges of the toenail away from engagement with the toe.
