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Objective: The aim of this study was to evaluate the effect of agents available in whitening toothpastes (Crest® and Sensodyne®) in vitro on the force decay of elastomeric chains used in orthodontics. Materials and Methods: A total of 300 specimens of elastomeric chains were divided into five groups (n = 60) and were evaluated. These groups included (1) the regular Crest® toothpaste and distilled water solution, (2) whitening Crest® toothpaste and distilled water solution, (3) regular Sensodyne® toothpaste and distilled water solution, (4) whitening Sensodyne® toothpaste and distilled water solution, and (5) distilled water as a control group. The samples' force was measured using Instron at intervals of 0, 1, 7, 14, 21, and 28 days. Data were analyzed by SPSS software. Results: At the initial time point, the difference in the force values of elastomeric chain between any of the groups was not significant (P &gt; 0.05). On the 1st day, there was a significant difference (P   0.05). On days 7, 14, and 28, the rate of decline for all groups was statistically significant (P &lt; 0.05). Conclusions: According to the results obtained in the present study, it seems that toothpastes without whitening agents have less effect on force decay of elastomeric chain over time.

The effect of toothpastes with bleaching agents on the force decay of elastomeric orthodontic chains