One of the many interesting and weird exhibits at Ripley's Believe it Or Not is the picture below. An Ubangi woman with wooden plates on her lips.
In Africa, a lower lip plate is usually combined with the excision of the two lower front teeth, sometimes all four. Among the Sara people and Lobi a plate is also inserted into the upper lip. Other tribes, such as the Makonde, used to wear a plate in the upper lip only. In many older sources it is reported that the plate's size is a sign of social or economical importance in some tribes.
In some Amazonian tribes, young men traditionally have their lips pierced when they enter the men's house and leave the world of women. Lip plates there have important associations with oratory and singing, and the largest plates are worn by the greatest orators and war-chiefs, like the well-known environmental campaigner Chief Raoni of the Kayapo tribe.
In South America, lip plates are nearly always made from light wood. In the Pacific Northwest of North America, among the Haida, Tsimshian, and Tlingit, lip plates used to symbolise social maturity by indicating a girl's eligibility to be a wife. The installation of a girl's first plate was celebrated with a sumptuous feast.