Effect of fluoride gel on color changes due to at-home tooth bleaching technique

Sensitivity is one of the most common complications of vital tooth bleaching and different materials such as fluoride can be used to reduce such tooth sensitivity. The aim of this study was to evaluate the effect of fluoride on tooth color changes before and after using bleaching materials.
In this clinical trial, 24 students aged 18‒25 years were selected. Initially, the color of 6 sound anterior maxillary and mandibular teeth was recorded under the same environmental condition and then photographic records were provided. The subjects were randomly divided into 3 groups. The subjects in group 1 used carbamide peroxide (CP) for at least 6 hours every night during sleep; the subjects in group 2 used phosphate fluoride (PF) before using CP and subjects in group 3 used phosphate fluoride (PF) gel after having used CP. After the tooth bleaching period, the tooth colors were recorded using Vita shade guide and the digital RGB (red, green, blue) method to evaluate the effect of the time of fluoride use on tooth color changes. Data were analyzed with paired t-test and ANOVA (α = 0.05).
Statistically there was no significant difference between groups in term of color changes using vita (p value = 0.154) and the RGB method (p value = 0.147).
The results of this study showed that use of PF gel before and after tooth bleaching did not affect the color change process.