| http://www.w3.org/ns/prov#value | - Additional whitening agents include anti-tartar/anti-calculus agents, including phosphates such as pyrophosphates, polyphosphates, polyphosphonates (e.g., ethane-1-hydroxy-1,1-diphosphonate, 1-azacycloheptane-1,1-diphosphonate, and linear alkyl diphosphonates), and salts thereof; linear carboxylic acids; and sodium zinc citrate; and mixtures thereof.
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