Teeth blackening
Teeth blackening or teeth lacquering is a custom in which a person's teeth are dyed black. It was most common in Southeast Asian and Oceanic cultures. It was most common with Austronesian, Austroasiatic, and Kra–Dai-speaking peoples. It was also done in Japan before the Meiji era and in India. Some groups in the Americas have also followed the custom. For example, it is practiced by the Shuar people of northern Peru and Ecuador.