Abstract
The aim of this clinical study was to evaluate tooth color changes (ΔE) and tooth sensitivity (TS) associated with whitening dentifrices. Sixty participants were selected according to inclusion and exclusion criteria and then allocated to three groups (n = 20): Colgate Luminous White (G1), Close Up White Now (G2) and Sorriso dentifrice (G3-control). The participants were instructed to use only the provided dentifrice and toothbrush in standardized oral hygiene procedures for 4 weeks. ΔE was assessed by spectrophotometry (CIELab System) whereas TS was determined by a visual analog scale at baseline and weekly using four assessment points. The data were analyzed by two-way ANOVA and Tukey's post-hoc test and Friedman test (α = 0.05). ΔE (baseline-assessment point 4) showed no significant difference (p>0.05) across the groups: G1 (ΔE = 5.1), G2 (ΔE = 6.8), and G3 (ΔE = 4.4). Δb (baseline-assessment point 4) was significantly different (p < 0.05) in G2 (3.8) when compared to G1 (-0.2) and G3 (0.3). There was no significant difference (p > 0.05) in TS at baseline. Both the control and whitening dentifrices caused similar tooth color changes (ΔE). There was no significant TS during the study period.
Highlights
Dentifrices claiming whitening properties are largely available all over the world and are the most accessible over-the-counter option to those who want to whiten their teeth, as tooth color has become an esthetic concern, especially in recent years.[1]
Colgate Luminous White® (Colgate-Palmolive Company, São Paulo, Brazil), Close Up White ® (Unilever, São Paulo, Brazil), and Sorriso® (Colgate-Palmolive Company, São Paulo, Brazil) dentifrices were clinically evaluated and compared as to their capacity of altering tooth color, using the colorimetric index according to the CIELab model and assessing tooth sensitivity by the visual analog scale (VAS). This was a double-blind, randomized controlled trial conducted at the School of Dentistry of Ribeirão Preto, University of São Paulo, Brazil, following the guidelines published by Consolidated Standards of Reporting Trials (CONSORT)
Despite no significant results for ∆E, its values were markedly high after 4 weeks, implying visible changes in tooth color in G1 (ΔE = 5.1), G2 (ΔE = 6.8), and G3 (ΔE = 4.4)
Summary
Dentifrices claiming whitening properties are largely available all over the world and are the most accessible over-the-counter option to those who want to whiten their teeth, as tooth color has become an esthetic concern, especially in recent years.[1] Studies have shown that dissatisfaction with discolored teeth ranges from 18 to 53%,2 being observed in approximately 40% of individuals aged 16 to 54 years.[1] In this sense, whitened teeth may influence quality of life as they improve satisfaction with dental appearance.[3] There are many approaches to manage intrinsic and extrinsic tooth discoloration, including at-home and in-office tooth bleaching treatment supervised by the dentist, restorative treatment, and even prosthetic treatment. Dentifrices, due to their ease of use and low cost, have been used as vehicles for whitening agents.
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