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  2. Tooth whitening - Wikipedia

    en.wikipedia.org/wiki/Tooth_whitening

    The nicotine and tar in tobacco, combined with oxygen, turns yellow and over time will absorb into the pores of enamel and stain the teeth yellow. The dark brown to black stains along the gum line of the teeth are the result of the porous nature of calculus immediately picking up the stains from nicotine and tar. Betel chewing. [12] Betel ...

  3. Tooth discoloration - Wikipedia

    en.wikipedia.org/wiki/Tooth_discoloration

    Tobacco: Tar in smoke from tobacco products (and also smokeless tobacco products) tends to form a yellow-brown-black stain around the necks of the teeth above the gumline. [12] Betel chewing. [13] Certain foods and drinks. Foods, such as vegetables, that are rich with carotenoids or xanthonoids can stain teeth.

  4. Human tooth - Wikipedia

    en.wikipedia.org/wiki/Human_tooth

    At that time, the first permanent tooth erupts. This stage, during which a person has a combination of primary and permanent teeth, is known as the mixed stage. The mixed stage lasts until the last primary tooth is lost and the remaining permanent teeth erupt into the mouth. There have been many theories about the cause of tooth eruption.

  5. Black coffee may keep your teeth from rotting - AOL

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  6. Tooth enamel - Wikipedia

    en.wikipedia.org/wiki/Tooth_enamel

    The agents most commonly used to intrinsically change the color of teeth are hydrogen peroxide and carbamide peroxide. Oxygen radicals from the peroxide in the whitening agents contact the stains in the interprismatic spaces within the enamel layer. When this occurs, stains will be bleached and the teeth now appear lighter in color.

  7. Coffee is more expensive — and it's only going to get worse

    www.aol.com/coffee-prices-hit-half-century...

    Coffee drinkers are already paying more: Data from the US Bureau of Labor Statistics show coffee prices for urban consumers rose sharply from July 2021 to February 2023. They remain elevated. They ...

  8. Oral hygiene - Wikipedia

    en.wikipedia.org/wiki/Oral_hygiene

    A 1930s poster from the Work Projects Administration promoting oral hygiene. Tooth decay is the most common global disease. [14] Over 80% of cavities occur inside fissures in teeth where brushing cannot reach food left trapped after eating and saliva and fluoride have no access to neutralize acid and remineralize demineralized teeth, unlike easy-to-clean parts of the tooth, where fewer ...

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