GB/T 43576-2023Oral care and cleaning products—Laboratory method of effect removal of extrinsic stain for toothpastes (English PDF)

1 Scope

This document describes the laboratory test method for the effectiveness of toothpaste in removing exogenous stains and gives the effectiveness of toothpaste in removing exogenous stains:

The principles, reagents and materials, instruments and equipment, measurement steps, result calculations, etc: of laboratory testing methods:

This document is applicable to the determination of the removal effect of exogenous stains on toothpastes that use mechanical friction as the main mechanism of action:

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, the dated quotations

For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document:

GB/T 3358:1-2009 Statistical vocabulary and symbols Part 1: General statistical terms and terms used in probability

GB/T 6682 Specifications and test methods for water used in analytical laboratories

GB/T 35832-2018 Toothpaste friction value detection method

3 Terms and definitions

The terms and definitions defined in GB/T 3358:1-2009 and the following apply to this document:

3:1 extrinsicstain

Color changes and staining of teeth caused by lifestyle:

Note: Such as drinking tea, smoking, drinking red wine and other eating habits:

3:2

The ratio of the difference in whiteness value before and after brushing of the tooth grinding block in the sample group to the difference in whiteness value before and after brushing in the control group:

Note: Expressed by PCR:

3:3 incisor

The first and second teeth are located on both sides of the midline of the upper and lower dental arches, a total of 8 teeth:

Note: They are called maxillary and mandibular central incisors and lateral incisors respectively:

3:4 t-testt-test

The t value is used as a statistic to test the difference between two independent or correlated normal population means:

3:5

Random group randomlocation

A method of randomly assigning research subjects to experimental groups and control groups: […]