Abrasivity expresses how much a dental care product wears down or abrades the tooth. It is made measurable by the RDA value (RDA = Radioactive dentin abrasion), which is taken as a guide value for the cleaning effect. Abrasive dental care products aim to remove plaque without attacking the enamel. So, when buying your dental care product, make sure that they do not contain abrasives or surfactants that are too aggressive.