Help me Same my Nail

I don't really know how to same a nail, but good luck.

If it were throbbing in pain, I'd say drill a small hole in it, but if it's not bad just try to figure out why it got hurt in the first place. 

Trim the nail, make sure it's not catching on socks, and make sure your shoes are the right size.  I've found the last two summers that I need a full size larger than my normal with long (> 6 mile) runs because my feet swell so much.

Usually when I think I'm going to lose the nail, I don't do anything.  Keeping it on as long as possible makes healing shorter in the long run than trimming it down or anything.  It seems to protect the new nail. 

Here is how to save them: Remove them all. You don't need those pesky things anyway

Note: Please don't take this as medical advice

OK, now for my real answer:

Nope, have never been successful at saving them once they turn black. Trimming it will certainly help once it starts to get loose though

I've bruised and lost a few toenails as well. I've found that sizing up my shoes, keeping my nails super short and tying my shoes a bit tighter using those extra holes that are at the top (there is this cross-tie you can do) keeps my feet from shifting around.

If it is lifted and hanging on, keep it as dry as possible because lifted toenails are more likely to get infections or fungus (yeah, really gross, but everything relating to runners' feet is).

Mine usually happen after half-marathon races outside.  I don't run on a treadmill too much.  Maybe that's another reason not to.   

I never run on the treadmill. I lost my big toenails after the Chicago Marathon last year. It was so hot that my feet were soaked the entire race so I think they slid forward more than usual. I lost a little toenail just a month or so ago and it was from moderate distances. I didn't know it was bruised or damaged until it fell off. Needless to say, I can't go to the pedicure lady anymore without horrifying her!