https://publish.kne-publishing.com/index.php/fid <p><strong><em>Frontiers in Dentistry (Formerly known as :Journal of Dentistry of Tehran University of Medical Sciences (JDT))</em></strong>&nbsp;is the first Iranian dental journal in English.&nbsp;<strong><em>FD</em></strong>&nbsp;is an Open Access,&nbsp;Peer-Reviewed bimonthly journal published by Dental Research Center (DRC) of Tehran University of Medical Sciences which is a dynamic, rapidly growing research center.</p> <p>The Journal aims to publish novel and high quality relevant information written by peers to researchers and readers involved in all fields of dentistry, oral health sciences and related&nbsp;<span dir="LTR">interdisciplinaries,&nbsp;</span>strives to keep pace with the rapid growth of publications, and move on to the edge of knowledge in this field.</p> <p><strong data-stringify-type="bold">All the manuscripts should be submitted through the Journal Primary Website at <a href="https://fid.tums.ac.ir/index.php/fid/about/submissions">https://fid.tums.ac.ir/index.php/fid/about/submissions</a></strong></p> Tehran University of Medical Sciences en-US Frontiers in Dentistry 2676-296X https://publish.kne-publishing.com/index.php/fid/article/view/18545 <p><strong>Objectives: </strong>The aim of this study was to assess the color change (∆E) of teeth following the use of several bleaching protocols with power bleaching.</p> <p><strong>Materials and Methods: </strong>This in vitro study evaluated 50 sound incisors and premolars. After cleaning, the teeth were immersed in a 2g/100mL tea solution for 6 days. The samples were randomly divided into 5 bleaching groups: Snow L [containing 40% hydrogen peroxide (HP) and 20% carbamide peroxide] with 980nm diode laser, White Smile (containing 32% HP) with LED (Monitex), Boost (containing 40% HP) with 980nm diode laser, Boost (containing 40% HP) with LED (Monitex), and Boost without activation. Color parameters were measured before and after staining, immediately and 1 week after bleaching by a spectrophotometer, and their ∆E was calculated and compared by one-way ANOVA followed by the Tukey’s test.</p> <p><strong>Results: </strong>All bleaching protocols improved the color parameters. The ∆E in each group was significant after bleaching compared to before bleaching in the cervical (P&lt;0.001), middle (P&lt;0.001) and incisal (P&lt;0.001) thirds. The ∆E was significant at 1 week compared to before bleaching (P=0.002 for the cervical, P&lt;0.001 for the middle, and P&lt;0.001 for the incisal third, respectively), immediately after bleaching compared with after staining (all Ps&lt;0.001), and also at 1 week compared with after staining (all Ps&lt;0.001).</p> <p><strong>Conclusion: </strong>Within the study limitations, all power bleaching protocols caused color change of the teeth. The efficacy of Boost (conventional bleaching), Boost plus LED, and White Smile was better than Snow L regarding color change of teeth.</p> Abolfazl Bazari Jamkhaneh Zohreh Moradi Sina Sadeghabadi Pooya Soltanzadeh Nasim Chiniforush Copyright (c) 2025 Frontiers in Dentistry 2025-05-03 2025-05-03 10.18502/fid.v22i16.18545