Provided is a corrective device for ingrown toenails and incurvated
toenails. The corrective device includes a central member made of a
shape-memory alloy; and prefabricated toenail side-engaging parts, each
being attached to both ends of the central member. The corrective device
of the present invention has advantages such as provision of strong
corrective force over the entire toenail, convenient use, suitability for
long-term use, straight growth of a toenail that will grow after a
surgical treatment of the ingrown toenail, and straightening of a curved
toenail.