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A common belief is that blackened teeth differentiated humans from animals. Teeth blackening is often done in conjunction with traditions of tooth sharpening and dental evulsion, as well as other body modification customs like tattoos. Teeth blackening and filing were regarded with fascination and disapproval by early European explorers and ...
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]
Angularis nigra, Latin for 'black angle', also known as open gingival embrasures, and colloquially known as "black triangle", is the space or gap seen at the cervical embrasure, below the contact point of some teeth. The interdental papilla does not fully enclose the space, leading to an aperture between adjacent teeth. [1]
Amalgam deposits can be found within bone occasionally. This can be caused during a surgical procedure e.g. tooth extraction or endodontic surgery, which has caused the material to become inadvertently dislodged from a restoration in an adjacent tooth. These deposits become blackened and can lead to blackening of the adjacent bone. [8]
Usually, bismuth produces a black line, due to bismuth sulfide, along the gums, near the teeth, similar to the Burton's line which can be found in lead poisoning. This is not likely to occur if the gum is edentulous or the gum and the teeth normal. It is more common when gingivitis and carious teeth are present. Bismuth excess may cause stomatitis.
The appearance of blood on your toothbrush bristles, or in your sink after a thorough cleaning is not something that you should ignore.