1. An oral care composition comprising:! a) at least one compound of formula I! M1-A-M2-B-M3 (I)! Where M1 and M3 are independently a monovalent or divalent metal； M2 is a polyvalent metal or metal oxide； and A and B are independently selected from the group consisting of C2-C6 dibasic, tribasic and tetrabasic acids； and! b) at least one orally acceptable solvent； ! where the composition is essentially free of water. ! 2. The composition according to claim 1, where M1 and M3 independently represent a monovalent metal selected from the group consisting of Na, K and Li. ! 3. The composition according to claim 2, where M1 and M3 are K.! 4. The composition according to claim 1, where M2 is a polyvalent metal selected from the group consisting of Ti, Sr, Sn, Mg, Ca, Mn and Zr. ! 5. The composition according to claim 4, where M2 represents Ti. ! 6. The composition according to claim 1, where M2 is a metal oxide selected from the group consisting of barium oxide (Ba), titanium oxide (Ti), strontium oxide (Sr), tin oxide (Sn) and zirconium oxide (Zr) . ! 7. The composition according to claim 6, where M2 is titanium oxide (Ti). ! 8. The composition according to claim 1, where the compound of formula I is selected from the group consisting of potassium oxalate of titanium oxide, titanium-calcium oxalate, potassium citrate of titanium oxide, potassium-calcium oxalate of titanium and mixtures thereof. ! 9. The composition of claim 8, where the compound of formula I is potassium oxalate of titanium oxide. ! 10. The composition of claim 8, where the compound of formula I is potassium citrate of titanium oxide. ! 11. The composition according to claim 1, where the composition is in the form of a liquid or mouthwash, dentifrices, pastes, powders, gel, tablets, medicinal1. Композиция для ухода за полостью рта, содержащая: ! a) по меньшей мере одно соединение формулы I ! M1-A-M2-B-M3 (I) !где M1 и M3 представляют собой независимо одновалентный или двухвалентный металл； M2 представл
