Dr. Mark Gregston has been practicing dentistry since 1994 and orthodontics since 2001. In 1994, he received his Bachelor of Arts degree and his Doctorate of Dental Surgery degree from the University of Missouri in Kansas City.  After graduation from dental school, he completed advanced studies in General Dentistry at Langley Air Force Base in Virginia. While on active duty, he completed additional advanced studies in Orthodontics and Dentofacial Orthopedics from the University of Missouri in Kansas City.  Dr. Gregston served 10 years on active duty in the United States Air Force before moving to Colorado.

Dr. Gregston belongs to many professional organizations including the American Association of Orthodontists, the American Dental Association, the Colorado Dental Association and the Rocky Mountain Society of Orthodontists.

As a part of his caring office, Dr. Gregston enjoys giving back to the community by volunteering with Donated Dental Services (an organization which treats patients with disabilities), SmileAgain Program (cost-free dental care to survivors of domestic violence in an effort to help individuals restore their oral health, assist in their recovery and support their efforts toward self-sufficiency), and Smiles Change Lives (an organization that promotes and provides access to life-changing, essential orthodontic treatment for children from low-income families).   

He and his family also donate time to the Denver Dumb Friends League by volunteering as foster parents to abandoned and/or abused animals.  In his additional spare time, Dr. Gregston enjoys spending time with his wife and three daughters, playing volleyball, softball and golf.