Well, it depends really. It can be caused by, fungus, injury or infections.
Fungus can cause certain things to happen to your toenail, for example, it could turn yellow, brown or white, it could become overgrown and thick and it could also begin to wear/crumble away and fall off. They always grow back. You can get special creams and liquids from your GP to help clear it up and become healthy again.
If you like a lot of sports, then this could also be another reason why your toenails fall off (friction). It can bleed underneath the nail and eventually cause it to fall off. To help reduce the chances of that happening, you could:
Hope this helped :)
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