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Tooth whitening or tooth bleaching is the process of lightening the color of human teeth. [1] Whitening is often desirable when teeth become yellowed over time for a number of reasons, and can be achieved by changing the intrinsic or extrinsic color of the tooth enamel. [2]
The Hitchhiker's Guide to the Galaxy [a] [b] is a comedy science fiction franchise created by Douglas Adams.Originally a 1978 radio comedy broadcast on BBC Radio 4, it was later adapted to other formats, including novels, stage shows, comic books, a 1981 TV series, a 1984 text adventure game, and 2005 feature film.
A dental crown is a tooth-shaped cap that covers or replaces a damaged tooth. Getting a crown improves the strength and appearance of your teeth.
A buffer solution is a solution where the pH does not change significantly on dilution or if an acid or base is added at constant temperature. [1] Its pH changes very little when a small amount of strong acid or base is added to it. Buffer solutions are used as a means of keeping pH at a nearly constant value in a wide variety of chemical ...
Pritzker was born in Palo Alto, California, on January 19, 1965.He is the son of Donald Pritzker and Sue Pritzker (née Sandel). [10] [2] A member of the Pritzker family, a Jewish family of Ukrainian descent [11] prominent in business and philanthropy during the late 20th century, [12] [13] Pritzker is named after both of his paternal uncles, Jay Pritzker and Robert Pritzker. [14]
Formaldehyde (/ f ɔːr ˈ m æ l d ɪ h aɪ d / ⓘ for-MAL-di-hide, US also / f ə r-/ ⓘ fər-) (systematic name methanal) is an organic compound with the chemical formula CH 2 O and structure H−CHO, more precisely H 2 C=O.
Joe Biden's tenure as the 46th president of the United States began with his inauguration on January 20, 2021. [1] [2] Biden, a member of the Democratic Party who previously served as vice president for two terms under President Barack Obama, took office after his victory in the 2020 presidential election over the incumbent president, Donald Trump of the Republican Party.
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