| 摘要 |
Toothpaste reducing the formation of dental calculus being substantially free from compounds releasing calcium ions contains as active ingredients a synergistic mixture of a di- and/or tetraalkali pyrophosphate and ethan1-hydroxy-1,1-diphosphonic acid and/or water-soluble salts thereof and/or alkylene diaminotetra(methylene phosphonic acids) and/or water-soluble salts thereof.
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