Systems and/or methods of treating and/or preventing nail disorders are disclosed herein. Also, disclosed herein are systems and/or methods of improving the appearance of a nail. A preferred embodiment of the present invention comprises a method of treating and/or preventing a nail disorder in a subject comprising topically applying a composition comprising a poly(urea-urethane)polymer and/or a poly(urea-urethane) pre-polymer to a nail of said subject, thereby treating and/or preventing said nail disorder.
