Nail fungus tends to look like thick, ridgy, yellow nails. Often the infected nail will also grow a type of cheese like substance under them, that when scraped out gives off a pungent, stinky smell. You can kill nail fungus by applying an over the counter treatment twice or more a day, or you can use the cheaper method. Simply applying Vix Vapo Rub three times a day, smearing it all over any affected toenails will eventually clear it up. However, you have to be prudent about your treatment, and keep treating it long enough for the nail to grow entirely out. Once you no longer see any yellow hue to the nail, no more strange cheese under it, and no more thick yellowness, you have been cured.