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Lu woman with black teeth in Northern Vitenam. To dye their teeth, the Lu women seek out Met and Xuyen trees in the forest and cut them into small pieces. They burn the pieces and use the smoke, which is led through a bamboo pipe to dye their teeth. After several applications of dying, the teeth become shiny black. The Lu ethnic women say that the blacker the teeth, the more beautiful they become and when they get older their teeth will be stronger and solid.