By Wendy Bumgardner, About.com
Updated December 04, 2008
About.com Health's Disease and Condition content is reviewed by our Medical Review Board
The key to preventing a black toenail is getting shoes that fit well, without giving too much or too little room.
You should also lace your shoes to prevent your foot from sliding forward in the shoe.
Warning: Next photos are realistic and unpleasant.
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