Hard fruits like apples kind of brush your teeth, as I understand it. They don't stick around like softer fruits do, and so are less likely to cause decay. Strawberries are an old-time tooth whitening remedy. Cheddar cheese, and other aged cheeses, like milk and also the sweetener xylitol (in sugar-free gum) have been clinically proven to inhibit formation of the plaque/decay bacteria.
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