IK, I have a solution that I've tried and tested, and found to work! No liver damage, but you'll want to keep it away from kids and pets, and wash your hands.
I got the infection 8 years ago, when I got a pedi for my wedding --- the doctors' drug box was a total failure. Nail got deformed, thick, yellow, and yikes! soft and thus painful in the closed shoes I was wearing to hide them.
So first things first, you want to get some AIR in there! I *know* it is hard, it feels like everyone thinks you have a terminal case of poor hygiene --- but get the polish off, and try to wear open-toed shoes as much as you can bear to. Fungus thrives in dark, enclosed, moist places. Which is why topical treatments usually fail. They just can't keep up. If it helps, I've found the more close-strapped gladiator style or the perforated uppers on some shooties provide camouflage while letting the air in.
Second, get yourself some TEATREE OIL pronto! If it's pure essential oil, you will need to mix a few drops in a vehicle of alcohol to aid penetration and thin it down (about 30% volume should do). But you might be able to find the kind of preparation meant for acne, which comes ready blended, sometimes with another carrier oil. Aim for 5-15% of teatree in there, if you get the latter. Apply twice a day --- I used a dropper to pour it on, then a cotton bud to make sure I ease it under the edges and into the sides of the nail bed. If your nail has thickened, it helps to *gently* file it thinner to help the penetration.
It takes TIME, I needed several months to see improvement (the new nail starts to grow in healhier) and seems very slow to heal. But teatree oil really works and I'm sure is way cheaper than laser if you have the patience. If you can combine it with the ACV once a day, better still.
(I know if that laser was available around my neck of the woods, I would have been sorely tempted to try it. But I had to go with cards I was dealt.)
Good luck!
