cavity and wet all surfaces. In contrast, in the case of inorganic fluorides the counter ion (e.g. sodium) has no transport function; the fluoride is statistically distributed in the oral cavity. Amine fluoride covers the tooth surfaces with a homogeneous molecular layer. This continuous film prevents rapid rinsing off by the saliva. The amine fluorides are thus available as an active agent for a longer period. Amine fluorides have a slightly acidic pH. For this reason, fluoride ions can combine rapidly with the calcium in dental enamel to form calcium fluoride. This acts as a fluoride depot over a longer period: Under cariogenic conditions fluoride ions are made available stimulating the remineralisation of dental enamel and thus prevent acid attacks. See also Silver diamine fluoride Olaflur References Dental drugs Oral hygiene Amines Fluorides