Ran a marathon and a few months after, half of the nail started to lift and detach itself from the toe. I didn't know what to do at the time and thought if I took it off it would grow back no problem... eventually the rest of the toenail came off and the keratin (I believe is what it's called) grew thick in its place and the nail still hasn't grown back. It's been about 6 years. I'm afraid the reality is that it will never grow back now. Am I right or is there hope still??