EP--92929 A In a dentifrice comprising 0.01-2 wt.% of water soluble ionic fluoride and an abrasive contg. metal cations which form a water insoluble fluoride, the improvement comprises inclusion of a water soluble ionic agent (I) which contains anions which form an insoluble cpd. with the cations of the abrasive, and cations which yield a soluble fluoride. - The F source is pref. an alkali metal, esp. Na or K fluoride or monofluorophosphate, in amts. to provide 0.025-0.25, esp. 0.05-0.15 wt.% F. The abrasive is e.g. Ca carbamate, in which case (I) is a sol. carbonate esp. a mixt. of Na carbonate and Na bicarbonate, or the abrasive can be a Ca phosphate, in which case (I) is a sol. phosphate e.g. K2HPO4. The compsn. contains 0.5-6 esp. 5-6 wt.% (I). - Loss of fluoride activity due to pptn. with cations from the abrasive is avoided. (Dwg.0/2) EPAB- EP--92929 B In a dentifrice comprising 0.01-2 wt.% of water soluble ionic fluoride and an abrasive contg. metal cations which form a water insoluble fluoride, the improvement comprises inclusion of a water soluble ionic agent (I) which contains anions which form an insoluble cpd. with the cations of the abrasive, and cations which yield a soluble fluoride. - The F source is pref. an alkali metal, esp. Na or K fluoride or monofluorophosphate, in amts. to provide 0.025-0.25, esp. 0.05-0.15 wt.% F. The abrasive is e.g. Ca carbamate, in which case (I) is a sol. carbonate esp. a mixt. of Na carbonate and Na bicarbonate, or the abrasive can be a Ca phosphate, in which case (I) is a sol. phosphate e.g. K2HPO4. The compsn. contains 0.5-6 esp. 5-6 wt.% (I). - Loss of fluoride activity due to pptn. with cations from the abrasive is avoided. (17pp Dwg.No.0/2) - EP--92929 B An oral hygiene composition of pH from 7 to 11, comprising from 0.01 to 2.0% by weight of the composition of a water soluble fluoride source consisting of an ionic fluoride optionally admixed with an ionic monofluorophosphate, an ionic abrasive material containing metal cations capable of forminq a water insoluble fluoride, and between 0.01% and 9% by weight of the composition of a water soluble ionic agent containing the anionic counter ions of the ionic abrasive together with metal cations capable of forming a water soluble fluoride. (9pp)g GBAB- GB2121278 B An oral hygiene composition comprising from 0.01 to 2.0% by weight of the composition of a water soluble fluoride source consisting of an ionic fluoride optionally admixed with an ionic fluoride optionally admixed with an ionic monofluorophosphate, an ionic abrasive material containing metal cations capable of forming a water insoluble fluoride, and, dissolved in the composition, between 0.01% and 9% weight of the composition of a water soluble ionic agent containing the anionic counter ions, as hereinbefore defined, of the ionic abrasive together with metal cations capable of forming a water soluble fluoride, with the proviso that when the abrasive comprises calcium phosphate, and the ionic agent comprises sodium phosphate, an ionic monofluorophosphate is not present.o USAB- US4565691 A Oral hygiene compsn. comprises (a) 0.01-20 wt.% of water soluble ionic fluoride (opt. mixed with an ionic monofluorophosphate) (b) 10-99 wt.% of water insoluble ionic abrasive material contg. metal cations which can form a water insoluble fluoride and (c) 0.01-9 wt.% of water soluble ionic agent contg. the anionic counterions of (b) together with the metal cations which can form water soluble fluoride. - Pref. (a) comprises an alkali metal fluoride (and opt. alkali metal monofluorophosphate) (c) comprises an alkali metal carbonate and/or -bicarbonate and (d) comprises CaCO3.