In this photo taken Friday, Aug. 3, 2018, Philippe Hujoel, a dentist and University of Washington professor, holds a model of teeth and a toothbrush as he talks in an office at the school in Seattle. Dental health experts worry that more people are using toothpaste that skips the most important ingredient - the fluoride - and leaves them at a greater risk of cavities. (AP Photo/Elaine Thompson)
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