Monday December 20th, 2010 informationliberation.com
Fluoride coating much thinner than thought (UPI)
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.

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