Fluoride concentration in the top-selling Brazilian toothpastes purchased at different regions

To be relevant in terms of public health, widely-used toothpastes should have at least 1,000 ppm of soluble fluoride (F) concentration. Thus, the concentrations of total fluoride (TF) and total soluble fluoride (TSF) in the top-selling Brazilian toothpastes were evaluated. Samples (n=3) from toothpastes Colgate Anti-cáries®, Colgate Total 12 Clean Mint®, Colgate Tripla Ação Menta Original®, Colgate Tripla Ação Menta Suave® and Sorriso Dentes Brancos® were obtained from each of the five regions of the country. The concentrations of TF and TSF were analyzed with ion-specific electrode calibrated with F standards and the results were expressed in ppm (µg F/g). All toothpastes showed TF concentration lower than 1,500 ppm F (1,388.2 ± 25.8 to 1,483.2 ± 98.2). The TSF values were higher than 1,000 ppm F and ranged from 1,035.5 ± 61.5 to 1,221.8 ± 35.2 for calcium carbonate/monofluorophosphate-based toothpastes and from 1,455.6 ± 12.5 to 1,543.0 ± 147.3 for silica/sodium fluoride-based toothpaste. Top-selling Brazilian toothpastes presented available fluoride concentration to control caries regardless of the region where they are purchased.

Para ter relevância em termos de saúde pública, os cremes dentais amplamente utilizados pela população devem ter fluoreto (F) solúvel numa concentração mínima de 1.000 ppm F. Assim, as concentrações de fluoreto total (FT) e flureto solúvel total (FST) nos cremes dentais mais vendidos no Brasil foram avaliados. Os cremes dentais (n=3) Colgate Anti-cáries®, Colgate Total 12 Clean Mint®, Colgate Tripla Ação Menta Original®, Colgate Tripla Ação Menta Suave® e Sorriso Dentes Brancos® foram obtidos nas cinco regiões do país. As concentrações de FT e FST foram analisadas com eletrodo íon-específico calibrado com padrões de F e os resultados foram expressos em ppm (µg F/g). Todos os cremes dentais apresentaram concentração de FT inferior a 1.500 ppm F (1.388,2 ± 25,8 a 1.483,2 ± 98,2). Os valores de FST foram superiores a 1.000 ppm F e variaram de 1.035,5 ± 61,5 a 1.221,8 ± 35,2 para cremes dentais a base de carbonato de cálcio/monofluorfosfato e de 1.455,6 ± 12,5 a 1.543,0 ± 147,3 para o creme dental à base de sílica/fluoreto de sódio. Os cremes dentais mais vendidos no Brasil apresentaram concentração de fluoreto solúvel para controlar cárie, independentemente da região onde foram comprados.

Timing of fluoride toothpaste use and enamel-dentin demineralization

It is well established that fluoride (F) prevents caries development by inhibiting demineralization and enhancing remineralization processes. However, it is not known which of these protective mechanisms is more important. In this double-blind, crossover in situ study conducted in three phases of 14 days each, 12 volunteers wore palatal appliances containing enamel and root dentin slabs, on which biofilm was allowed to accumulate under exposure to 20 percent sucrose solution 8×/day. F toothpaste was used once a day, either before the daily demineralizing episodes (in the morning) or after them (at night). Non-F placebo toothpaste was used in the control group. F toothpaste significantly reduced enamel and dentin demineralization compared with the control (p < 0.05). F toothpaste was more effective when used after the demineralization episodes than before, and this difference was statistically significant for dentin (p < 0.05). The results suggest that brushing with F dentifrice at night to remineralize daily mineral losses may be preferable to brushing in the morning to inhibit the demineralizing episodes of the day.