Are there any home remedies for black toenails?

Black nails. Black nails can be caused by trauma from running and hitting your toes in the toe box. Another one could be a toe nail fungus called tinea nigra. You would need to be evaluated by a family doctor or a podiatrist.
A few. Home remedies for nail fungus include: vick's vaporub listerine mouthwash tea tree oil they might help the appearance a little, but usually does not cure the infection. On the plus side they are cheap, and will cause no harm. It can also be a bruised toenail, which if painless usually fade in time. If painful it might be a hematoma that needs podiatric treatment. If all fails, see a podiatrist.