Question

why should we not allow nails to grow

Answer 1

hope it will help you

Answer 2

Cells in the root of the nail flatten and become harder (due to keratin in them), and then as new cells form below them, they push these hard cells out and they become the nail. Nails look pink because of the network of tiny blood vessels underneath which feed the nail bed. The nails themselves do not need any food.
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