You’ve probably had some. White lines or spots that appear and grow out with your nails. Why does this happen? There are a few reasons, ranging from bumping your nail to poisoning. Check out his Quick Question to see what might apply to you!
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Mee’s Lines: https://commons.wikimedia.org/wiki/File:Mee%27s_lines.JPG
Toe Fungus: https://commons.wikimedia.org/wiki/File:Toefungus.jpg
Nail Anatomy Diagram: https://commons.wikimedia.org/wiki/File:Human_nail_anatomy.jpg
Nail Matrix: https://commons.wikimedia.org/wiki/File:Blausen_0406_FingerNailAnatomy.png