Best of my knowledge, you have to wait till it grows out; dark colored nail polish stains the nail surface.

I guess if you had a very fine nail buffer, it might help, but be careful not to buff so much that your nail surface thins to the point where it's sensitive. Not pleasant.

That's why I don't use dark colors anymore; plus, once they chip/peel, it's so much more obvious than with lighter colors.

Okay, truth be told, the only polish I use anymore is for my toenails; I don't keep my nails long anymore anyway.