The effect of commercial whitening toothpastes on erosive dentin wear in vitro

•Whitening toothpastes present different abrasivity, which depend on their composition.•Pyrophosphate salts seem to enhance the abrasive potential of toothpastes.•Whitening toothpaste with blue covarine is as abrasive as the conventional one. This study evaluated the erosive tooth wear promoted by commercial whitening toothpastes on eroded dentin in vitro. Ninety bovine roots were embedded, polished and subjected to the baseline profile analysis. The samples were protected in 2/3 of the dentin surface and were randomly assigned to 6 groups (n = 15/group): Oral-B 3D White; Close-up Diamond Attraction Power White; Sorriso Xtreme White 4D; Colgate Luminous White; Crest and erosion only. All samples were submitted to erosive pH cycles (4 × 90 s in 0.1% citric acid, pH 2.5, per day) and abrasive challenges (2 × 15 s, per day) for 7 days. The samples were subjected to abrasion, using toothbrushing machine, soft toothbrushes and slurries of the tested toothpastes (1.5 N, 1:3 water). Between the challenges, the samples were immersed in artificial saliva. The final profile was overlaid to the baseline profile for the calculation of the erosive dentin wear (μm). The data were subjected to Kruskal-Wallis/Dunn tests (p