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From left, Erica Regan, a dental assistant, and Dr. Allison Gerlach install a crown on one of Ehren Foster?s teeth, while Dr. Deborah Studen-Pavlovich and Dr. Corbin Salthouse monitor his vital signs at the University of Pittsburgh Pediatric Dental Center, Aug. 22, 2017. In rare cases, children fall into a much deeper level of sedation than intended, and if they aren?t rescued quickly, they may stop breathing or even die. (Jeff Swensen/The New York Times/Fotoarena)
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