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[Longitudinal studies on the effect of fluorine in drinking water on the periodontium during development and maturity].

Longitudinal clinical studies of the periodontium have been carried out in the same subjects aged 14 and again 26 years old who-since their birth till the time of maturity-were drinking water with a trace, overoptimal amount of fluorine. Fluorine has been shown to decrease susceptibility of the periodontium tissues to pathogenic factors.