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Let it do it naturally. I had a particularly choice toe nail even after running 2 HMs in a week (she brags).
Ended up with a blister at the base of the nail and 2 underneath. About 6 weeks later it fell off very neatly, sort of opened like a book cover and dropped off leaving a new little pinky underneath.
Boots sell great toe protectors btw, highly recommend them.
Or you can get foam protectors, they absorb sweat so aren't as likely to slip off.
Am so glad I'm not the only one with this problem, my feet aren't great to look at at the best of times - but I've had a reccurring issue with my middle toes in particular - they just won't stay on!!! hehe! I think I need to get some tape for my tootsies as I think it's the only solution!