Watt
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Eyebrows and eyelashes

Eyebrows and eyelashes vary among people, and their growth is shaped by heredity and other biological factors. But the absolute claim that every person’s brow shape is unique has not been established. Cosmetics can change their appearance, and some medicines have changed hair density in studies; pencils and mascara do not alter growth, while active products near the eyes require care.

Biology affects hair growth; cosmetics affect appearance.