Research Questions How Much Fluoride Really Helps to Fight Cavities.
Study are showing that the protective shield fluoride forms on teeth is up to 100 times thinner than previously believed. This new study done found that the fluorapatite layer formed in this way is only 6 nanometers thick. It would take almost 10,000 such layers to span the width of a human hair. That’s at least 10 times thinner than previous studies indicated.