A version of this story appears in the September 2020 issue of National Geographic magazine. Philadelphia detected its first case of a deadly, fast-spreading strain of influenza on September 17, 1918.
Brian T. Luong, DMD, is an orthodontist at Anaheim Hills Orthodontics and Santa Ana Orthodontics and Chief Dental Officer at Become Aligners. Adults need a pea-sized amount of toothpaste for effective ...
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