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<http://webisa.webdatacommons.org/17942183>	<http://www.w3.org/ns/prov#value>	"Polyphosphate is also known as a good chelating agent to enhance the teeth whitening effect to some extent since it can effectively remove stains formed on the surface of the teeth, especially those formed of metal such as iron, calcium, magnesium, etc. derived from foods or working circumstances." .