The aim of this clinical study was to evaluate the effect of various rinsing protocols on oral acid production 6 h after tooth brushing with an amine fluoride/stannous fluoride (AmF/SnF2) toothpaste. After a 14-day period of using F-free toothpaste, 30 participants followed three experimental protocols each, followed by F-free washout periods in a randomized crossover trial. They used AmF/SnF2 toothpaste twice daily for 1 week, and after brushing, they either rinsed with tap water, omitted the post-brush rinse, or rinsed with an AmF/SnF2 mouthwash. In the F-free washout periods, the participants brushed their teeth without further instructions. Six hours after the last brushing (± rinsing) of each period, subjects rinsed with 10 ml 10% sucrose solution for 2 min. A tongue film sample and a buccal plaque sample were taken 4 and 8 min after the sucrose challenge, respectively. Metabolic acid ions were determined by capillary electrophoresis. The results show that (1) omitting the post-brush water rinse did not reduce the production of lactic, acetic or minor acids in plaque, nor on the tongue, and that (2) the additional use of AmF/SnF2 mouthwash after brushing reduced the acid production in plaque and tongue samples for at least 6 h. The distributions of acids produced in the plaque or tongue samples were not statistically different between experimental periods. It is concluded that an increase in the antimetabolic effect of AmF/SnF2 toothpaste in between two daily brushing exercises is not achieved by omitting the post-brush water rinse. The additional use of AmF/SnF2 mouthwash after brushing is effective in reducing the acid metabolism in dental plaque and tongue flora.

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