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In page Lip plate:

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In South America among some Amazonian tribes, young males traditionally have their lips pierced and begin to wear plates when they enter the men's house and leave the world of women.[1][2] Lip plates there are associated with oration and singing.[citation needed] The largest plates are worn by the greatest orators and war chiefs,[citation needed] such as Chief Raoni of the Kayapo tribe, a well known environmental campaigner. In South America, lip plates are nearly always made from light wood.