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 itoggle caption Morgan Walker/NPR The Salt Microbiome Candy: Could A Probiotic Mint Help Prevent Cavities? December 10, 2013 Lacing a sugar-free candy with the right kind of bacteria might one day help fight off tooth decay, a study suggests. The experimental mint lowered the levels of cavity-causing bacteria in volunteers' saliva. But the microbe candy still has a long way to go before it reaches shelves at Walgreens.