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 multivalent metal or metal oxide； A and B are independently selected from the group consisting of C2-C6 dibasic, tribasic or tetrabasic acids； and! b) at least one orally acceptable solvent； ! where the composition for caring for the oral cavity has a pH of at least 2.0. ! 2. The composition according to claim 1, where the pH is in the range from 2.5 to 7.0. ! 3. 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. ! 4. The composition according to claim 3, where M1 and M3 are K.! 5. The composition according to claim 1, where M2 is a divalent metal selected from the group consisting of Ti, Sr, Sn, Mg, Ca, Mn and Zr. ! 6. The composition according to claim 5, where M2 is Ti. ! 7. 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) . ! 8. The composition according to claim 7, where M2 is titanium oxide (Ti). ! 9. 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. ! 10. The composition according to claim 9, where the compound of formula I is potassium oxalate of titanium oxide. !eleven. The composition of claim 9, wherein the compound of formula I is potassium titanium oxide citrate. ! 12. The composition according to claim 1, additionally containing a pH buffer. ! 13. The composition according to item 12, where the pH buffer is1. Композиция для ухода за полостью рта, содержащая: ! a) по меньшей мере одно соединение формулы I ! M1-A-M2-B-
