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Tooth discoloration has increased the demand by patients to pursue aesthetic treatment options. Bleaching is considered a conservative approach in performing an aesthetic treatment for discolored teeth; however colour rebound and post-operative sensitivity are among the adverse effects associated with vital bleaching. This study were to evaluate the degree of colour change after vital tooth bleaching using a 35% hydrogen peroxide gel (Yotuel© Special, Biocosmetics Laboratories, Spain), using a spectrophotometer (CM- 2600d Konica, Minolta) to measure the colour change at each intervention during the bleaching process, to assess the post operative sensitivity during the first week of the intervention, to evaluate the patients perception of the colour change and to compare it to the colour change ( E) expressed in numeric values and to investigate whether gender differences exist in relation to the outcome of the bleaching procedure.

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B.D.S degree in dentistry (Bachelor of Dental Surgery) awarded on the 27th of June 2005 by the University of Jordan, Amman Jordan. MSc (Dent) (restorative dentistry)-Clinical, University of the Western Cape (UWC), South Africa. Part-time Lecturer ´´Restorative Dentistry´´ Jordan University of Science and Technology.

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