Vicks VapoRub is an effective treatment for nail fungus, according to Mayo Clinic. Patients apply the ointment directly to their nails with cotton swabs. Over-the-counter antifungal creams and ointments are other treatments for nail fungus. For maximum effectiveness, patients should trim and thin the nails before applying any antifungal treatment.
Thick, brittle and deformed nails can be a sign of nail fungus. The nails may also appear dark because of debris build-up under the nails. In some cases, the nails become painful and may give off a bad odor. An untreated nail can also separate from the nail bed, warns Mayo Clinic.