Press Releases Independent Study Confirms Discus Dental’s ZOOM!™ Chairside Tooth Whitening System Out-Performs Ultradent’s Opalescence® Xtra® Boost™ Culver City, CA (November 25, 2002) — An independent study recently conducted by Hill Top Research, a leading contract clinical research firm, confirmed that Discus Dental’s ZOOM! Chairside Tooth Whitening System out-performs Ultradent’s chairside product, Opalescence Xtra Boost. Results of the Clinical Study - ZOOM! Chairside System vs. Opalescence Xtra Boost Kit. The objective of this clinical study was to compare the whitening/bleaching efficacy of two professional in-office whitening products over a 7 day period: Discus Dental’s ZOOM! Chairside System (25% Hydrogen Peroxide whitening gel with whitening lamp) and Opalescence Xtra Boost Kit (38% Hydrogen Peroxide whitening gel), using the Vita® Shade Guide and Chromameter measurements. The measurements were taken at baseline, Day 1, Day 2 and Day 7 post-treatment. At the conclusion of the study, while the statistical analysis of the Vita shade scores indicated that both products lightened the color of teeth, the ZOOM! Chairside System was significantly better than the Opalescence Xtra Boost Kit at all time points. Post-treatment, the difference in improvement was over 2 shades. The ZOOM! Chairside System was also significantly better seven days after the procedure. This study will be published in the Journal of Clinical Dentistry by the end of 2002. A full abstract on this study can be found in the new ZOOM! Online Research Center located on Discus Dental’s website: www.discusdental.com. About Discus Dental About Discus Dental: Founded in 1993, Discus Dental, Inc. is a leader in the dental industry in the marketing and distribution of premium aesthetic and clinical products to dental professionals. The company also provides practice building tools and services as well as expert industry training for the dental community. Discus Dental is headquartered in Culver City, California. More information is available at www.discusdental.com.