Method: forty participants, selected according inclusion and exclusion criteria were allocated in experimental groups T1D1, T1D2, T2D1 e T2D2; considering: T1= carbamide peroxide 16% (Whitness Perfect®); T2= Hydrogen peroxide 35% (Whitness HP®), D1= desensitizing dentifrice (Colgate Sensitive Pro-alivio®) and D2= desensitizing paste (Colgate Sensitive Pro-alivio®). Volunteers (n=10 per group) were evaluated for TS, using visual analogue scale (VAS), before the beginning of the dental bleaching treatments (T1 and T2) and during the next 14 days (3º, 7º, 10 º e 14º days) in which the desensitizers products were applied according with manufacturer´s instructions. Data were analyzed intra and inter-group, statistically using Kruskal–Wallis and posterior Dunn tests.
Result: dental bleaching treatments T1 and T2 caused significantly TS increase, considering TS baseline values. TS caused by T1 was significantly lower (p<0.01) than that caused by T2 when using D1 (TS/T1=6,20 xTS/T2=24,0) and D2 (TS/T1=14,0xTS/T2=41,90). D1 was more effective than D2 in reducing TS caused by T1(p<0,001) and T2 (p<0,001).
Conclusion: the desensitizing products tested showed different effects in TS caused by dental bleaching treatments T1 and T2. The home-use desensitizing (D1) was more effective than in-office (D2) in reducing TS in dental bleaching treatments T1 and T2.