Whitening efficacy of three over-the-counter oral rinses

The aim of the study was to determine the whitening efficacy of three different oral rinses.

Eighty extracted teeth were randomly divided into four groups, cleaned with a slow-speed handpiece with pumice and placed in a staining broth for 14 days. Measurements of tooth shades were measured with a spectrophotometer. Three groups (20 each) were then exposed to Colgate Plax Whitening Blancheur (A), White Glo 2 in 1 (B) and Plus White (C) for 21 days for 2 minutes a day and in between stored in artificial saliva. The other group acted as a control and was only stored in the artificial saliva.

The Kruskal-Wallis and Tukey-Kramer analysis showed no statistical significant differences (on a 5% basis) for the differences between base-line and after treatment (21 days) for deltaL*, deltaa*, deltab* and deltaE*ab median values amongst the control, Colgate Plax Whitening Blancheur, White Glo 2 in 1, and Plus White.

None of the 3 commercially available oral rinses resulted in any significant bleaching effect on the teeth over a 21 day treatment period.