Robert W. Gerlach ,Dr. Gerlach is a principal Scientist in Worldwide Clinical Clinical Investigations at the Procter & Gamble Company, Cincinnati Ohio USA, In that role. Dr. Gerlach is responsible for studies evaluation the safety and efficacy of oral care products worldwide. His clinical trials research includes initiatives in the areas of caries prevention, periodontal therapy, clinical methods. and others. His recent research has focused in the area of whitening. including development of objective method for assessing color change. Dr. Gerlach is a public health dentist who received a dental degree from the University of Michigan and a public health degree from the University of South Florida. His work experience includes various government an academic appointments as well as extensive private practice experience. Dr. Gerlach's research is reported in over 100 manuscripts, abstracts, and clinical study reports e-mail: gerlach.rw@pg.com,

Xiaojie Zhou ,Dr. Xiaojie Zhou is a statistician at the Procter & Gamble Company, Cincinnati, OH, USA. Dr. Zhou received her M. Sc. in Mathematics and PhD in Statistics from McGill University at Montreal, Canada. She continued her research in statistics at University of Waterloo as a post-doctoral fellow. Her current research interests include design and analysis of oral care clinical trials. e-mail: zhou.x@pg.com,

Chris Herren ,Chris Herren, DMD serves as Clinical Team Leader in the Comprehensive Care Clinic in the Department of Oral Health Practice at the University of Kentucky, College of Dentistry. e-mail: Cherr0@pop.uky.edu,

John Lindroth ,John Lindroth, DDS is an Assistant Professor and also serves as a Clinical Team Leader in the Department of Oral Health Practice at the University of Kentucky, College of Dentistry.,

Barry K. Freydberg ,Dr. Barry Freydberg, is a graduate of the University of Illinois, a Fellow of the Academics of General Dentistry, the International College of Dentists and the International Academy for Dental-Facial Esthetics. He is considered a pioneer in raising the awareness of dental professionals about the ever-growing link between high technology and practice management., Dr. Freydberg is also a consultant to the American Dental Association Council on Dental Practice. He can be contacted via e-mail on his web site at: http://www.hitech2thdoc.com,

Edward B. Fowler ,Dr. Fowler is the Chief of periodontics at the United States Army Dental Activity, Fort Wainwright, Alaska. He is a a diplomat of the American Board of Periodontontology. E-mail: fowtered@worldent.att.net, fowtered@worldent.att.net

Lawrence G. Breault ,Dr. Breault is the Chief of Periodontics and Periodontic Mentor, AEGD 1-Year at The United States Army Dental Activity, Schofield Barracks, Hawail. He is a diplomat of the American Board of Periodontology. E-mail: breault@mail.aloha.net,

Khalid Almas ,Associate Professor, School of Dental Medicine, University of Connecticut, Farmington, Connecticut, USA,

Khalid A. Al Wazzan ,Dr. Al Wazzan is an Assistant Professor in the Department of Prosthetic Dental Sciences at the King Saud University College of Dentistry in Riyadh, The Kingdom of Saudi Arabia. He is a member of the Saudi Dental Society Board of Directors. e-mail: alwazzan@ksu.edu.sa,

Salah E. Al Shethri ,Dr. Salah E. Al Shethri serves as a Clinical Demonstrator in the Department of Restorative Dental Sciences at the King Saud University College of Dentistry in Riyadh, The Kingdom of Saudi Arabia.,

Mohammed Q. Al Qahtani ,Dr. Mohammed Q. Al Qahtani serves as a Clinical Demonstrator in the Department of Restorative Dental Sciences at the King Saud University College of Dentistry in Riyadh, The Kingdom of Saudi Arabia.,