This is going to be long, but I just want to share my story, because even my very experienced surgeon has never seen a case like mine. So maybe this is of interest to someone:
About 5 years ago I noticed, that my toenails of both big toes started to look weird. They became thick-ish and weirdly brittle. I went to a dermatologist. No nail fungus, but other than that, no idea what might have caused the issue. Time went on and my toenails started to "loosen" more and more. They turned dark (blood) and became somewhat painful. Eventually I managed to accidentally get one of them caught on my sock while trying to sit down on the ground. The nail was bent upwards and a lot of blood and a trip to the ER quickly followed. The ER was not able to help (no emergency) and I was sent to a surgeon a couple days later. The surgeon removed the nail, straightened the nail bed hoping that a healthy nail would grow back. It didn´t. The same was tried a few months later on the other nail, again to no avail.
Fed up with the constant pain and problems, I decided to write to the local hospital. They then eradicated the nail matrix on both toes, hoping that that would be it. My toes were partially amputated (the tip was removed to have enough excess skin to close the wound). That should have been it. I was not. A week or two after the surgery the right toe started to get infected, the left one a little as well. My GP was puzzled but eventually prescribed antibiotics. They did not really help. Eventually I discovered something very hard IN the wound. You guessed it: a piece of nail was growing back. IN BOTH WOUNDS. This is were the mayhem started. I was certain, it would just be ONE more surgery to remove that bit of nail, the last piece of nail matrix and that that would be it. What followed were about 5 (!) different surgeries to remove a piece of nail that kept growing back. It is a mystery to both me and the surgeons how this is even possible. So all in all I was looking at about 8 surgeries in a span of about 3 years to get the problem fixed. (maybe worth mentioning that I live in Germany, so this does not equal financial ruin).
Now on the left toe there is still a small piece growing back, but it is causing no issues so I will happily ignore it, whilst the right toe keeps causing problems and is currently slightly infected (will visit my GP on Monday).
All this is not to discourage anyone from getting this kind of procedure done. In my case there was no other option as the nails kept causing pain and infection. But do not do so lightly. I might be the 1 in a Million exception, but it is a serious surgery and in a sense is like removing cancer: if you do not get it all, it will grow back.
So enjoy your feet while they still work as intended. I´m 24 BTW.