To use vinegar to treat nail fungus, first choose a type of vinegar, such as white, apple cider, rice or balsamic. Any variety is safe to use, but apple cider vinegar is the most common option. Before applying the vinegar, file and trim down the nail. Soak any infected nails in a tub of equal parts water and vinegar for 30 minutes, three times a day for several weeks.
After soaking the nail, completely dry the finger or toe, as any excess moisture is harmful to an infected nail. At least twice a day, apply two drops of vinegar directly onto the base of the nail, and dry after a few minutes. Fill a spray bottle with equal parts water and vinegar, and spray the affected nails and any space under the nail before bed, wearing a cotton sock on affected feet overnight.
Some severe infections take a few months to heal. The acid in the vinegar treats the infection and reduces symptoms such as itching or pain. However, the infected portion of the nail has to grow out completely before treatment stops. Avoid tight shoes or nylon footwear to reduce sweaty feet for infected toenails. Always consult a physician before beginning any treatment, especially if you are diabetic or have a compromised immune system.