| Summary: | This in vitro study investigated the extrinsic tooth-whitening effect of bleaching products containing polyphosphates on the dental enamel surface compared to 10% carbamide peroxide (CP). Eighty human molars were randomly allocated into four whitening-products groups. Group A (control) was treated with 10% CP (Opalescence). The other groups with non-CP over-the-counter (OTC) products were group B = polyphosphates (iWhiteWhitening-Kit); group C = polyphosphates+fluoride (iWhite-toothpaste); and group D = sodium bicarbonate (24K-Whitening-Pen). <i>L</i>*, <i>a</i>*, <i>b</i>* color-parameters were spectrophotometer-recorded at baseline (T0), one day (T1), and one month (T2) post-treatment. Changes in teeth color (ΔE<sub>ab</sub>) were calculated. Data were analyzed using ANOVA and the Bonferroni test (α = 0.05). Groups A, B, and D showed significant differences in Δ<i>L</i>*&Δ<i>a</i>* parameters at T1, but not in Δ<i>b</i>* at T0. Group C showed no difference for Δ<i>L</i>*, Δ<i>a</i>*, Δ<i>b</i>* at T0 and T1. Group A showed differences for Δ<i>L</i>*, Δ<i>a</i>*, Δ<i>b</i>*, at T2, while groups B, C, and D had no difference in any parameters at T0. At T1, ΔE<sub>ab</sub> values = A > D> B > C (ΔE<sub>ab</sub> = 13.4 > 2.4 > 2.1 > 1.2). At T2, ΔE<sub>ab</sub> values increased = A > B > C > D (ΔE<sub>ab</sub> = 12.2 > 10.6 > 9.2 > 2.4). In conclusion, the 10% CP and Biomimetic polyphosphate extrinsic whitening kit demonstrated the highest color change, while simulated brushing with dark stain toothpaste and a whitening pen demonstrated the lowest color change at both measurement intervals.
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