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Human body
Fingernails grow about twice as fast as toenails.
A fingernail grows roughly 3.5 millimetres a month and takes around six months to replace itself completely. A toenail grows about 1.6 millimetres a month and needs over a year.
Why is this true?
Growth is linked to blood flow and to how much the nail is used. Nails on the dominant hand and on the longest fingers grow fastest, and all nails grow faster in summer than in winter.
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