I don’t think you can. You can eat the right things to make them grow a bit stronger so they don’t fray so fast. (toenails apparently grow a lot slower!)
Chris is certainly right about the toenails and the diet. Nails grow faster or slower depending on general health, so eating a balanced diet which includes plenty of vitamins is important. They also grow faster in summer than in winter! Perhaps you could experiment like this: http://jclahr.com/science/earth_science/thumbnail/index.html
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