Why Do Our Fingernails Grow Faster Than Toenails?

为什么指甲比脚趾甲长得快？

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Fingernails grow about twice as fast as toenails—roughly 3.5 mm per month versus 1.6 mm—due to differences in blood flow and usage.
Fingers receive richer circulation and experience more frequent minor trauma, both of which stimulate nail matrix cell division.

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