De-mineralization of your tooth enamel is inevitable every day due to the acids that erode your teeth, even with proper brushing and flossing. What fluoride helps to do is to reverse the effects of the de-mineralization process, reducing the risk for cavities and sensitivity,for more details- http://www.slideshare.net/florencedentistry/lets-break-the-controversy-on-fluoride-63321052
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