One sample of soft deposit was taken from each of 143 11 to 13-year-old children performing weekly mouth rinses with 10 ml 0.2% NaF or 0.2% NaCl. F was determined, and the ppm F calculated on the dry weight basis. The mean ppm F was 55 ± 53. F decreased with increased weight of samples. Neither F, tooth-brushing before rinsing, nor sex had any significant effect on F in plaque samples collected 4–5 days after the last rinsing. In a previous series comprising 57 children, the ppmF was elevated about 1 day after NaF rinses. The effect of F in plaque is discussed with respect to gingivitis and caries.

Keywords:
Fluoride analysis, Plaque, fluoride content
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© 1971 S. Karger AG, Basel
1971
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