Thème : IIIe Congrès International d'odonto-stomatologie du 15 au 21 juillet 1977 à Rio de Janeiro.
Commentaires : Le timbre montre un serpent entourant
un manche, le tout sur un fond écrit des mots " agua H2O " &
" NaF Fluor ". La protection des dents par des traitements chimiques de l'eau potable fut introduite au Brésil dès 1976 à l'occasion du 3e Congrès International d'Odontologie qui s' est tenu au Brésil. Le timbre fut vendu au profit de la fluorisation de l'eau pour la réduction des caries dentaires.
The stamp from Iceland that accompanies this note was issued on 9 October 1987 to promote oral hygiene and shows a girl brushing her teeth with a fluoride-containing toothpaste before going to sleep, a pretty clear message about the importance of such practice. On the other hand, the Brazilian stamp was issued on 15 July 1977 to celebrate the 3rd International Congress of Odontology, held in Rio de Janeiro on 15–21 July of that year. It prominently displays a rod of Asclepius, the emblem of the medical profession. The Portuguese words for water and fluorine (agua and fluor, respectively) and the chemical formulas of water and sodium fluoride appear several times in the background, thereby underscoring the value of water fluoridation to prevent dental caries. Sodium fluoride, together with stannous fluoride (SnF2) and sodium monofluorophosphate (Na2PO3F), are the three most common sources of fluoride currently added to toothpaste formulations.
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