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Young Tonkin girl with black painted teeth, c. 1905 Vietnamese old woman selling chewing gum. Her teeth have the dark red hue of betel chewers. In China there has been knowledge of the custom of teeth blackening throughout history, although it was not practiced in the domains of the Middle Kingdom, nor did the majority of its ethnic groups. [6]
Teeth blackening or teeth lacquering is a custom of dyeing one's teeth black. It was most predominantly practiced in Southeast Asian and Oceanic cultures, particularly among Austronesian , Austroasiatic , and Kra–Dai-speaking peoples .
Nyssa sylvatica, commonly known as tupelo, black tupelo, black gum or sour gum, [2] [a] is a medium-sized deciduous tree native to eastern North America from the coastal Northeastern United States and southern Ontario south to central Florida and eastern Texas, as well as Mexico.
It is a very common oral condition and affects 13% of the world population. It is often due to poor oral hygiene which leads to accumulation of oral bacteria and build up of keratin on the tongue surface. Black hairy tongue can also be associated with the use of certain medications such as antibiotics, prolonged coffee/tea drinking habit, or ...
It is a very thin, black-blue line visible along the margin of the gums, at the base of the teeth. [1] [2] It is caused by the reaction between circulating lead and sulphur ions produced by oral bacteria, forming deposits of lead sulfide in the gums. [3] The sign was described in 1840 by Henry Burton: [4]
Smoker's melanosis is seen with the naked eye as a brown to black pigmentation of the oral tissue i.e. the gums, [1] cheeks or palate [2] as well as in larynx. [3] [4] It is most often seen in the lower labial gingiva of tobacco users. Most easily it is found in Caucasians, due to their lack of a genetically caused melanin pigmentation. [5] [6]
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