My GP was useless with my ingrowing toenail, he would just cut it in half (which REALLY hurt) then hope it didn't ingrow again, which of course it did, every time, for 10 years. Eventually I just stopped going and lived with the pain. I couldn't jog or anything, but I was sort of alright. Eventually though it got worse so I went to a podiatrist, who took one look at it, and said 'yep, thats gotta come out', then looked at my other foot, in which the big toe had only been ingrowing for about a week, and said, 'that's coming out too'. So she said I should go to this other clinic, just to check, and instead of checking, they removed the nails there and then.
Basically, they injected the base of my big toe (I'll admit that it stung a bit) and did the same to the other toe. They recommended that I didn't watch, and I felt quite small amounts of pressure, but no pain, after about 5 minutes, they said I could look now, they had already covered it. They showed me the nails, and they were pretty huge. They told me that they had put some pretty powerful acid, where the nail grows from, which prevents nail regrowth. I had to go back 2 weeks later for redressing, I saw it and nearly fainted, so yeah don't look.
Now I don't have any nails on either big toe, as they didn't regrow, the nerves are slightly damaged so it doesn't hurt at all. It doesn't look that bad either, I just wish my bloody GP had sent me to the podiatrist in the first place.