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Does fluoride really fight cavities by 'the skin of the teeth?'

Date:
December 18, 2010
Source:
American Chemical Society
Summary:
In a study that the authors describe as lending credence to the idiom, "by the skin of your teeth," scientists are reporting that the protective shield fluoride forms on teeth is up to 100 times thinner than previously believed. It raises questions about how this renowned cavity-fighter really works and could lead to better ways of protecting teeth from decay, the scientists suggest.

In a study that the authors describe as lending credence to the idiom, "by the skin of your teeth," scientists are reporting that the protective shield fluoride forms on teeth is up to 100 times thinner than previously believed. It raises questions about how this renowned cavity-fighter really works and could lead to better ways of protecting teeth from decay, the scientists suggest.

Their study appears in ACS' journal Langmuir.

Frank Mόller and colleagues point out that tooth decay is a major public health problem worldwide. In the United States alone, consumers spend more than $50 billion each year on the treatment of cavities. The fluoride in some toothpaste, mouthwash and municipal drinking water is one of the most effective ways to prevent decay. Scientists long have known that fluoride makes enamel -- the hard white substance covering the surface of teeth -- more resistant to decay. Some thought that fluoride simply changed the main mineral in enamel, hydroxyapatite, into a more-decay resistant material called fluorapatite.

The new research 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. The scientists question whether a layer so thin, which is quickly worn away by ordinary chewing, really can shield teeth from decay, or whether fluoride has some other unrecognized effect on tooth enamel. They are launching a new study in search of an answer.


Story Source:

The above story is based on materials provided by American Chemical Society. Note: Materials may be edited for content and length.


Journal Reference:

  1. Frank Müller, Christian Zeitz, Hubert Mantz, Karl-Heinz Ehses, Flavio Soldera, Jörg Schmauch, Matthias Hannig, Stefan Hüfner, Karin Jacobs. Elemental Depth Profiling of Fluoridated Hydroxyapatite: Saving Your Dentition by the Skin of Your Teeth? Langmuir, 2010; 26 (24): 18750 DOI: 10.1021/la102325e

Cite This Page:

American Chemical Society. "Does fluoride really fight cavities by 'the skin of the teeth?'." ScienceDaily. ScienceDaily, 18 December 2010. <www.sciencedaily.com/releases/2010/12/101215121918.htm>.
American Chemical Society. (2010, December 18). Does fluoride really fight cavities by 'the skin of the teeth?'. ScienceDaily. Retrieved September 23, 2014 from www.sciencedaily.com/releases/2010/12/101215121918.htm
American Chemical Society. "Does fluoride really fight cavities by 'the skin of the teeth?'." ScienceDaily. www.sciencedaily.com/releases/2010/12/101215121918.htm (accessed September 23, 2014).

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