When you think of foods that cause cavities, candy and soda probably come to mind. But tooth decay isn’t just triggered by obvious sugar bombs—some everyday foods that seem healthy or harmless can be surprisingly tough on your teeth. Cavities form when bacteria in your mouth feed on sugars and carbohydrates, producing acids that weaken enamel. Below are 4 foods that might look innocent on your plate but could be quietly increasing your risk for decay.