十万个为什么·科学启蒙30篇（3）
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My Nails Keep Growing Every Week
我的指甲每周都在长
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Your nails grow slowly from the base near your cuticles.
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New cells push older ones forward as they multiply under the skin.
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Fingernails grow faster than toenails because fingers get more blood flow.
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Nail growth speeds up slightly when you're younger or during warm weather.
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Biting your nails doesn’t stop them from growing — it just makes them shorter.
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Healthy eating helps keep nails strong, but won’t change their growth rate.
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You can trim fingernails every 7–10 days to keep them neat and clean.
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Doctors check nail color and texture to learn about your general health.
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Nails don’t feel pain because they have no nerves inside the hard part.
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Even when you sleep, your nails are quietly adding tiny new layers.