This invention relates to oral care compositions, for example comprising a salt of a basic amino acid having a pH in solution of less than 7.5, an abrasive having a pH in solution of less than 7.5, and a fluoride ion source, and an acid selected from the group consisting of: a carboxylic acid (e.g., citric acid, lactic acid, glycolic acid, acetic acid, succinic acid, or fumaric acid), and an inorganic acid, wherein the inorganic acid is not phosphoric acid or sulfuric acid (e.g., wherein the inorganic acid is hydrochloric acid or sodium acid pyrophosphate), and to methods of using and of making these compositions.