The scariest part of the holiday comes in the days that follow, as parents fight and negotiate to limit how much candy their kids eat. NPR's Gisele Grayson decided to pay her kids off to give up their loot. iStockphoto hide caption

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Dr. Curtis Chan, a dentist in Del Mar, Calif., loads up a truck with 5,456 pounds of candy to deliver to Operation Gratitude during the Halloween Candy Buyback on Nov. 8 last year. Chan personally collected 3,542 pounds of candy from patients. Courtesy of Curtis Chan hide caption

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A sweet way to avoid the dentist? Microbiologists are developing a probiotic mint that uses dead bacteria to fight off cavities. Morgan Walker/NPR hide caption

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Kids might be more satisfied if they get one good treat instead of one good treat and one lesser treat. hide caption

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Is there an angel or a devil behind the mask? Scientists say it may not matter in terms of anonymous behavior. Joel Saget/AFP/Getty Images hide caption

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