How do fingernails know how and when to stop growing?

Question

How do fingernails know how and when to stop growing?

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Answer 1

TLDR: they don’t

Finger and toenails grow constantly, that’s why we have to cut them otherwise they’ll just keep getting longer and longer until they wear down or break off.

Toenails grow at about half the rate of finger nails, and the rate can change depending on your health and diet.

But they never stop growing