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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 tattoo is a grey, blue or black area of discoloration on the mucous membranes of the mouth, typically on the gums of the lower jaw. It is a healthcare caused lesion, due to entry of dental amalgam into the soft tissues. It is common, painless, and benign, but it can be mistaken for melanoma
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]
Green stains also result from foods with chlorophyll or excessive exposure to copper or nickel. Amalgam, a common dental restorative material, may turn adjacent areas of teeth black or gray. Long term use of chlorhexidine, a mouthwash, may encourage extrinsic stain formation near the gingiva on teeth. This is usually easy for a hygienist to remove.
This leads to calculus buildup, which compromises the health of the gingiva (gums). Calculus can form both along the gumline, where it is referred to as supragingival (' above the gum '), and within the narrow sulcus that exists between the teeth and the gingiva, where it is referred to as subgingival (' below the gum ').
The appearance of blood on your toothbrush bristles, or in your sink after a thorough cleaning is not something that you should ignore.
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]
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