Abstract: A nail straightener, for use on a toenail or fingernail having a nail surface, a nail edge, and located atop a nail bed, comprising a pair of rails extending along the nail surface. The rails each have a hook portion which extends over the nail edge and extends partially beneath the nail, between the nail and nail bed to prevent the nail edge from growing into the nail bed as the nail grows. A bridge connects the rails, and has an adhesive for allowing the nail straightener to be selectively secured to the nail surface, removed and repositioned thereon as the nail grows, and then re-adhered to the nail surface.