The use of desensitizing dentifrices to occlude dentinal tubules consist of a treatment modality for hypersensitivity caused by exposed cervical dentin. Objectives: The aim of this study was to evaluate the dentin tubules occlusion ability of three commercially available dentifrices: Sensodyne (SE), Emoform (EM) and Sorriso (SO). Methods: Fifty freshly extracted human sound third molars were mesio-distally sectioned and cervical dentin was ground wet with 600,100,1200 SiC paper. Afterwards, they were polished with 6, 3, ½ and ¼ mm diamond pastes in order to simulate hypersensitive cervical regions. The samples were randomly divided into five groups (n=10): G1 - no brushing; G2 – brushing without dentifrice; G3 – brushing with SE; G4 – brushing with EM; G5 – brushing with SO. G3, G4, and G5 specimens were brushed with slurries of toothpastes at constant loading using the same reciprocal action eletric motor driven toothpaste machine (Equilabor), during 4 minutes per day, for 7 days. Specimens were prepared and inspected under SEM at X1,000 (DSM 940A/ZEISS) for calculation of the percentage of occluded tubules. Results: Data were statistically analyzed by ANOVA and Tukey test (p<0.05). All dentifrices promoted a high number of dentin tubules occlusion: G1- 37.31% ± 24.22%a; G2- 22.92% ± 15.19%a, G3- 80.12% ± 24.65%b, G4- 96.02% ± 5.24%b, G5- 98.83% ± 3.31%b. Conclusions: The use of dentifrices (G3, G4 and G5) promoted a statistically superior number of tubules occlusion than did the no brushing (G1) and brushing with no dentifrices (G2) groups.

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