<P> The lip plate, also known as a lip plug or lip disc, is a form of body modification . Increasingly large discs (usually circular, and made from clay or wood) are inserted into a pierced hole in either the upper or lower lip, or both, thereby stretching it . The term labret denotes all kinds of pierced - lip ornaments, including plates and plugs . </P> <P> Archaeological evidence indicates that labrets have been independently invented no fewer than six times, in Sudan and Ethiopia (8700 BC), Mesoamerica (1500 BC), and Coastal Ecuador (500 BC). Today, the custom is maintained by a few groups in Africa and Amazonia . </P> <P> 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 of Chad, a plate is also inserted into the upper lip . Other tribes, such as the Makonde of Tanzania and Mozambique, used to wear a plate in the upper lip only . Many older sources reported that the plate's size was a sign of social or economical importance in some tribes . But, because of natural mechanical attributes of human skin, the plate's size may often depend on the stage of stretching of the lip and the wishes of the wearer . </P> <P> Among the Surma (own name Suri) and Mursi people of the lower Omo River valley in Ethiopia, about 6 to 12 months before marriage, a young woman has her lip pierced by her mother or one of her kinswomen, usually at around the age of 15 to 18 . The initial piercing is done as an incision of the lower lip of 1 to 2 cm length, and a simple wooden peg is inserted . After the wound has healed, which usually takes between two and three weeks, the peg is replaced with a slightly bigger one . At a diameter of about 4 cm, the first lip plate made of clay is inserted . Every woman crafts her own plate and takes pride in including some ornamentation . The final diameter ranges from about 8 cm to over 20 cm . </P>

What is the purpose of african lip plates