SAARBRUCKEN, Germany, Dec. 17 (UPI) -- German researchers say fluoride's protective cavity shield on teeth is a 100 times thinner than previously thought.
[...] the researchers find this fluorapatite layer is only 6 nanometers thick -- much thinner than anyone had expected.
The researchers pointed out 10,000 of these layers would be needed to span the width of a human hair. They have suggested a layer this thin may be quickly worn away by ordinary chewing and question whether a layer this thin can shield teeth from decay or whether fluoride has some other unrecognized effect on tooth enamel.
This site contains copyrighted material the use of which in some cases has not been specifically authorized by the copyright owner. Such material is made available for the purposes of news reporting, education, research, comment, and criticism, which constitutes a 'fair use' of such copyrighted material in accordance with Title 17 U.S.C. Section 107. If you wish to use copyrighted material from this site for purposes of your own that go beyond 'fair use', you must obtain permission from the copyright owner. It is our policy to respond to notices of alleged infringement that comply with the DMCA and other applicable intellectual property laws. It is our policy to remove material from public view that we believe in good faith to be copyrighted material that has been illegally copied and distributed by any of our members or users.