It is an interesting question that of the fluorine, also I have appeared with this and other substances of massive, sure use that will exist sensitive persons doing patogenesias. There are many questions in homeopathy opened, like for example, the remedies have preferential places according to his(its) origin, that is to say, it is more coffea tosta or raw(unripe) in Colombia that in Spain? Or it is possible that it is more Canadian cistus in Canada that in Brazil?... If the plants and the substances are in a few places and not in others, why not to think that the persons who are these remedies also are in a few places and not in others? They are questions to think... Regards.