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  2. Ohaguro - Wikipedia

    en.wikipedia.org/wiki/Ohaguro

    Ohaguro existed in Japan in one form or another for hundreds of years, and was considered a symbol of beauty for much of this time. Objects with a deep black color, such as those lacquered to a glossy black, were considered to be of great beauty, and many shades of black were used in dyeing kimono, with different shades holding different meanings.

  3. Tooth discoloration - Wikipedia

    en.wikipedia.org/wiki/Tooth_discoloration

    The appearance and perception of a tooth is the result of a complex interaction of factors such as lighting conditions, translucency, opacity, light scattering, gloss and the human eye and brain. [5] Of these, the intrinsic pigmentation of a tooth is the most influential, [4] which in turn is determined by genetic and natural factors. [6]

  4. Calculus (dental) - Wikipedia

    en.wikipedia.org/wiki/Calculus_(dental)

    Heavy staining and calculus deposits exhibited on the lingual surface of the mandibular anterior teeth, along the gumline Calculus deposit (indicated with a red arrow) on x-ray image In dentistry , calculus or tartar is a form of hardened dental plaque .

  5. Oral pigmentation - Wikipedia

    en.wikipedia.org/wiki/Oral_pigmentation

    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 ...

  6. Tooth decay - Wikipedia

    en.wikipedia.org/wiki/Tooth_decay

    The teeth most likely affected are the maxillary anterior teeth, but all teeth can be affected. [95] The name for this type of caries comes from the fact that the decay usually is a result of allowing children to fall asleep with sweetened liquids in their bottles or feeding children sweetened liquids multiple times during the day.

  7. Tooth hurts: Why are people turning on invisible dental ... - AOL

    www.aol.com/news/tooth-hurts-why-people-turning...

    IN FOCUS: As SmileDirectClub ceases operations and leaves thousands of customers in the lurch, Ellie Muir asks whether the invisible braces industry has become too bloated for its own good

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