Laser treatment can also be done, which penetrates the nail to kill the fungus below. Probelle claims that 94% of patients in a clinical trial experienced improvement within six weeks. We typically recommend it to most patients. Flat feet can affect anyone of any age. You can also make a warm Listerine foot bath by using equal parts warmwater and Listerine with one cup Epsom Salts. These infections take between 6 and 12 weeks to clear up. Almond Oil - Natural treatment for brittle nails with almond oilAlmond oil can prevent nail fungal disease from developing.