Eat strawberries for dessert Dentists tell us we should brush after every meal, but sometimes it's just not possible. The (delicious) alternative: Eat strawberries for dessert. The red fruit has a high percentage of folic acid, which naturally exfoliates and cleans your teeth, says Smigel. Into DIY products? Smigel says you can even mash some strawberries, mix them with baking soda, and brush your teeth with the mixture for a natural whitening alternative to toothpaste.