A METHOD OF DEMONSTRATING STAIN-PROOF EFFICACY OF AN ORAL CARE COMPOSITION

摘要

The present invention provides a method of demonstrating stain-proof efficacy of an oral care composition, comprising the steps:
(a) sticking hydroxyapatite powder uniformly onto a substrate;
(b) immersing the substrate sticked with hydroxyapatite powder into a slurry or solution of the oral care composition;
(c) drying the immersed substrate; and
(d) contacting the dried substrate with a slurry or solution of stain to observe stain's behavior.