Objective:The purposes of this longitudinal whitening study were to determine the stability, post-treatment side effects, and patient satisfaction after six months active treatment of tetracycline teeth with 10% carbamide peroxide (Opalescenceâ) at 7.5 years (84-100 months). Methods:Fifteen of the 21 patients participating in the study (71%) were contacted and asked to participate in a survey concerning their whitening experience. Subjects were asked whether or not there had been any change in the shade of their teeth post-treatment. Subjects were also asked if they had experienced any side effects during the post-treatment period that were whitening related and their perception of the procedure. Results: Nine (60%) reported no obvious change or only a slight darkening not noticed by others, 1 (7%) reported a slight darkening that is probably noticeable by other people, 1 (7%) reported moderate darkening. No one reported darkening back to original shade; however, 4 participants (27%) reported retreating their teeth. All respondents (15) denied having to have a crown, or root canal, that they felt was whitening related. One participant (7%) reported having TS and/or GI post-treatment; however, they also reported sensitivity to hot and cold pre-treatment. All 15 participants (100%) were glad they went through the whitening process and 14 (93%) would go through it again. Eight of the 15 participated in a clinical exam. The gingival texture, contour, and color of each patient were WNL. No periapical pathology (abscess, external resorption) was noted on radiographic examination and enamel surface morphology as viewed under the SEM at 200 and 2000 magnification appeared normal. Conclusions:This whitening study suggests that shade stability may last at least 7.5 years (range 84-100 months) post-treatment in patients with tetracycline-stained teeth with minimal side effects. In terms of patient satisfaction, patients are overwhelmingly positive about the procedure. Research Support: Ultradent, Inc.