Table 2.

Effect of brushing regimen on F⁻ content of samples collected immediately after brushing (unadjusted mean ± SE)

Treatment	n	Expectorate, μg	Rinse, μg	Toothbrush washings, μg	Amount of F− delivered to oral cavity, μg
45 seconds 0.5 g,1 × 15 (1,150 ppm F)	37	244 ± 15.2	104 ± 6.2	181 ± 14.7	134 ± 12.2
45 seconds 1.5 g, 1 × 15 ml (1,150 ppm F)	35	701 ± 49.8	253 ± 14.8	350 ± 16.7	612 ± 48.1
60 seconds 0.5 g, 1 × 15 ml (1,150 ppm F)	38	266 ± 12.4	97 ± 3.6	149 ± 9.1	118 ± 12.9
60 seconds 1.5 g, 1 × 15 ml (1,150 ppm F)	36	801 ± 45.4	238 ± 12.1	337 ± 24.4	531 ± 42.3
120 seconds 0.5 g, 1 × 15 ml (1,150 ppm F)	39	325 ± 12.4	80 ± 4.2	104 ± 7.2	127 ± 12.9
120 seconds 1.5 g, 1 × 15 ml (1,150 ppm F)	40	1,031 ± 46.9	173 ± 12.1	195 ± 16.4	483 ± 40.7
180 seconds 1.5 g, 1 × 15 ml (1,150 ppm F)	40	1,183 ± 41.7	114 ± 7.4	135 ± 12.0	481 ± 40.5
60 seconds 1.5 g, 3 × 15 ml (1,150 ppm F)	38	781 ± 51.1	372 ± 22.2	289 ± 19.6	505 ± 51.2
60 seconds1.5 g, 1 × 15 ml (250 ppm F)	35	156 ± 10.6	72 ± 3.7	90 ± 5.8	90 ± 12.1

The amount of F⁻ delivered to the oral cavity was calculated by subtracting the amount in the expectorate, rinse and toothbrush washings from the theoretical dose. The theoretical doses were: 1725 μg F⁻ for 1.5 g of 1,150 ppm F⁻, 575 μg F⁻ for 0.5 g of 1,150 ppm F⁻ and 375 μg F⁻ for 1.5 g of 250 ppm F⁻ dentifrice.