Patent ID: 8557224

Claim:
A method of treating teeth, comprising alternately applying a first composition (A) and a second composition (B) to a tooth: the first composition (A) containing a sodium fluoride and an inorganic phosphoric acid or a salt thereof, wherein: an aqueous solution of said first composition has a pH value ranging from 3 to 5.5, the molar ratio of said sodium fluoride to said inorganic phosphoric acid or salt thereof falls in the range of 0.1 to 10, the content of said sodium fluoride ranges from 0.025 mol/l to 0.5 mol/l, and the content of said inorganic phosphoric acid or a salt thereof ranges from 0.05 mol/l to 1 mol/l wherein said inorganic phosphoric acid or a salt thereof is orthophosphoric acid or a metal salt thereof; and the second composition (B) containing a monofluorophosphate and a calcium salt of polyol phosphate, wherein: an aqueous solution of said second composition has a pH value ranging from 7 to 11.5 an organic acid constituting the calcium salt of organic acid has a pKa value ranging from 3 to 11, or at least one pKa value ranging from 3 to 11 when the organic acid has plural pKa values, the content of said calcium salt of polyol phosphate ranges from 0.02 to 0.5 mol/l, the content of said monofluorophosphate ranges from 0.05 to 5 wt % and said calcium salt of polyol phosphate is selected from the group consisting of calcium glycerophosphate and calcium glucose-l-phosphate.