Effectiveness of over-the-counter tooth-whitening strips and toothbrushing for stain removal

Abstract

The present study compared the effectiveness of brushing and over-the-counter tooth-whitening strips on stain removal. Forty bovine teeth were used. Initial color readings were taken, and half of the samples were stained with grape juice for 7 days. The others teeth were used as the control. Both stained and control teeth were randomly separated into 2 groups (n=10) according to the treatment they underwent: whitening strips 2 times/day for 30 minutes for 7 days and mechanical brushing for 1 year using toothpaste. After treatments, new color readings were taken and results of color stability (ΔE) and changes in coordinates (ΔL, Δa, Δb) were statistically analyzed (2-way ANOVA, Bonferroni p