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Portrait of an unidentified shopkeeper as he poses with his son at a market, Tanintharyi Region, Myanmar, 2012. The man's teeth are stained red with Areca nut (also known as betel nut), used similarly (and with similar effects) to chewing tobacco. (Photo by Scott Wallace/Getty Images)

Portrait of an unidentified shopkeeper as he poses with his son at a market, Tanintharyi Region, Myanmar, 2012. The man's teeth are stained red with Areca nut (also known as betel nut), used similarly (and with similar effects) to chewing tobacco. (Photo by Scott Wallace/Getty Images)