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In page Teeth blackening:

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Teeth blackening is usually done during puberty.[citation needed] It was seen as a sign of maturity, beauty, and civilization.[citation needed] A common belief is that blackened teeth differentiated humans from animals.[citation needed] Teeth blackening is often done in conjunction with traditions of tooth sharpening and dental evulsion, as well as other body modification customs like tattoos.[citation needed] Teeth blackening and filing were regarded with fascination and disapproval by early European explorers and colonists.[citation needed]