Have there been any successful cases in banishing toenail fungus forever?

Fungus. Of course. Diligence is needed by the patient to assist with this. I find laser works on heavy nails also but more than one treatment is needed.
Sometimes. If you take an oral medication for toenail fungus and it works you have to be very diligent about using topical anti fungal creams to prevent it from coming back. Laser only seems to work on toenails that are not very thick.The tendency to catch toenail fungus is most likely inherited.