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Warren Loeppky has been a pediatric dentist in the Canadian city of Calgary for 20 years. Over the last decade, he says, tooth decay in children he’s seen has become more common, more aggressive and more severe. Many of his young patients have so much damage that he has to work with them under general anesthesia.

“It’s always sad seeing a young child in pain,” Loeppky says. “Dental decay is very preventable. It breaks your heart to see these young kids that aren’t able to eat.”