Tooth whitening is a procedure that has been increasingly requested by patients around the world, whether at home or in office bleaching. Tooth sensitivity is the main side effect of bleaching. It have a great power to interfere negatively in the quality of life of those affected. According to the literature, about 51% of people who had at-home bleaching developed postoperative sensitivity. The objective of this clinical, randomized, double-blind study is to evaluate the effectiveness of the association of casein phosphopeptides-fluoridated amorphous calcium phosphate with photobiomodulation in the treatment of tooth sensitivity after home bleaching, with 22% carbamide peroxide and also evaluate the effectiveness of at home bleaching through color analysis. For develop this study, 50 patients will be selected, with no previous history of sensitivity, aged between 18 and 30 years. They will be divided into four treatment groups: PLACEBO group; CPP-ACPF group; LASER group; LASER+CPP-ACPF group. Home bleaching treatment will use 22% carbamide peroxide. Patients should use two hours a day for 21 days. The desensitizing treatments will be applied in four moments, according to the group of each patient: before starting the bleaching treatment; after one week of the bleaching treatment; after two weeks of whitening treatment and after three weeks of whitening treatment. Sensitivity will be assessed using a visual analogue scale (VAS), where patients should daily mark their pain level (from 0 to 10) on each side of the arcade. After the 21 days of treatment, they will receive a new VAS, to evaluate if was any sensitivity will occur during 30 days after the bleaching treatment. In parallel with bleaching treatment and sensitivity treatment, the color analysis of teeth 13, 11, 21 and 23 will be performed, with the Vita Easyshade Advance 4.0 spectrophotometer, to monitor the bleaching performance, in each week. The first one will occur before starting the bleaching treatment (baseline) and a new measurement will be performed every week, together with the application of treatments for sensitivity. The collected data will be tabulated in an Excel Microsoft Windows 2010) spreadsheet and analyzed in the Jamovi 1.6.23 (The Jamovi Project, 2020) software. For inter- and intra-group analysis of sensitivity values, the Repeated Measures statistical test will probably be used. For all statistical analyses, a significance level of 5% will be adopted.
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Sensitivity assessment
Timeframe: Afeter 21 days of tooth whitening