Introduction: to date most clinical studies evaluating tooth whitening capabilities of bleaching products rely on the use of shade guides and the clinicians's perception of color change. This perception is very complex and subjective, as often such factors as ambient lighting, the color of the patient's skin, make-up, and clothing will change over the period of the study.Objective: This study first performed a subjective evaluation of color change on patient's teeth with Vita Classical Shade Guide (VCSG). Then an objective evaluation was performed using a Spectro-photometer, Vita Easy-Shade (VES) (Vident). Methods: A total of 15 subjects ages 18-25 yrs with a baseline tooth shade ranging from VCSG A1-C4 were selected. 12 patients were treated with Zoom (Z)(Discus Dental) and 3 with Boost (B)(Ultradent). Baseline (bl), postoperative (po), 24hr, 7 day(7d), and 1 month(1m), 3 month(3m), and 6 month(6m) readings were taken of all maxillary teeth using VCSG and VES. The clinician performing bleaching procedure was not involved in baseline shade taking and those evaluating the shade at recall were not aware of bleaching product used. Results: Both Z and B showed dramatic color change using VES and VCSG at 24hr, 7d, 1m and continued to be fairly stable for 3m,6m. Immediate po, VES showed some unexpected variation in readings for each tooth while VCSG showed stark color change for each tooth treated. At 24hr,7d,1m, 3m,and 6m VCSG was very consistent with its readings, however, VES showed initial variation which may be due to initial surface changes after bleaching. Conclusions:(1) Both Z and B performed well in this study with significant color change initially and sustained stability over3 months, 6 months. (2)The bleaching process does effect accuracy of VES readings immediately po, (3)objective use of VES is initially unstable compared to subjective use of VCSG.

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