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  2. Tooth enamel - Wikipedia

    en.wikipedia.org/wiki/Tooth_enamel

    The enamel on primary teeth has a more opaque crystalline form and thus appears whiter than on permanent teeth. The large amount of mineral in enamel accounts not only for its strength but also for its brittleness. [6] Tooth enamel ranks 5 on Mohs hardness scale (between steel and titanium) and has a Young's modulus of 83 GPa. [4]

  3. Striae of Retzius - Wikipedia

    en.wikipedia.org/wiki/Striae_of_Retzius

    Produced during the second stage of enamel calcification, also known as the maturation stage, ameloblasts produce matrix and enamel at the rate of 4 micrometers per day; however every fourth day there is a change in development. Brownish lines, the striae of Retzius, develop as a result of a change in the growth process.

  4. Chalky teeth - Wikipedia

    en.wikipedia.org/wiki/Chalky_teeth

    Since 1920, various derivatives of "chalky teeth" have appeared in the academic literature to describe specific dental anomalies. Most references are to enamel defects that have a chalky appearance (white, cream or brown) and are of developmental origin (i.e. amelogenesis imperfecta, enamel hypomineralisation, dental fluorosis, molar hypomineralisation).

  5. Human tooth development - Wikipedia

    en.wikipedia.org/wiki/Human_tooth_development

    Teeth affected by regional odontodysplasia nevAmelogenesis imperfecta is an autosomal dominant disease characterized by a defect in dental enamel formation. Teeth are often free of enamel, small, misshapen, and tinted brown. The cause of these deformities is due to a mutation in enamel in expression.

  6. Dental fluorosis - Wikipedia

    en.wikipedia.org/wiki/Dental_fluorosis

    The white opaque areas in the enamel of the teeth are more extensive but do involve as much as 50% of the tooth. Moderate: 4: All enamel surfaces of the teeth are affected and surfaces subject to attrition show wear. Brown stain is frequently a disfiguring feature Severe: 5: All enamel surfaces are affected and hypoplasia is so marked that the ...

  7. 14 perfect 10-year anniversary gifts to give your wife - AOL

    www.aol.com/lifestyle/10-year-anniversary-gifts...

    It comes with six attachments, including a wide-tooth comb, flyaway tamer, curling barrel, paddle brush head, diffuser, and large round volumizing brush head. $500 at Ulta Beauty Explore More ...

  8. Taco Bell brought back 5 discontinued items from the last 60 ...

    www.aol.com/taco-bell-brought-back-discontinued...

    Original release: The Meximelt was on Taco Bell's menu for 30 years before it was discontinued in 2019. The dish, which first appeared in the '80s, features a tortilla full of seasoned beef, pico ...

  9. Tooth whitening - Wikipedia

    en.wikipedia.org/wiki/Tooth_whitening

    As the age of the person increases, the teeth can also appear yellower over time. [15] Below are examples of intrinsic sources of stains: Tooth wear and aging: Tooth wear is a progressive loss of enamel and dentine due to tooth erosion, abrasion and attrition. As enamel wears down, dentine becomes more apparent and chromogenic agents are ...

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