I have been using tea tree oil on my toe nails. I soak a Q-tip in it, and hold it on the nail for 30 seconds. New Q-tip for each nail. I do this twice a day. I was getting good results, and had almost completely cleared it up on several nails, when I ran out and had to use the cheap stuff from Walmart that dh had. My nails immediately started getting worse. I bought a different brand on Amazon, and I'm not sure that it is working as well as the first brand. I think it really does matter what quality you get.