Meet The Team


Our team keeps up-to-date on new orthodontic advances by attending continuing education classes and many seminars, conferences, and lectures every year.

We are a strong team that works together to provide the best orthodontic treatment to our favorite member of our team: YOU! We hold many staff meetings and continue to communicate the need of our patients to each other and to consistently provide treatment in the best possible manner. Our orthodontic team of professionals has more than 100 years of combined experience in providing outstanding orthodontic services to our patients.
Dr. Mark Johnston

Dr. Mark Johnston

Dr. Mark Johnston graduated from the University of Georgia (UGA), where he received a Bachelor of Science degree in Biology. He entered the Medical College of Georgia in Augusta, and received his Doctorate in Dental Medicine (D.M.D.) degree. After dental school, Dr. Johnston continued his education at the University of Alabama at Birmingham (UAB). He completed a Hospital Dentistry Residency where he received a certificate in Hospital/General Practice Dentistry.

Dr. Mark Johnston

Dr. Mark Johnston graduated from the University of Georgia (UGA), where he received a Bachelor of Science degree in Biology. He entered the Medical College of Georgia in Augusta, and received his Doctorate in Dental Medicine (D.M.D.) degree. After dental school, Dr. Johnston continued his education at the University of Alabama at Birmingham (UAB). He completed a Hospital Dentistry Residency where he received a certificate in Hospital/General Practice Dentistry.

Dr. Johnston was a Research Assistant for the Department of Oral and Maxillofacial Surgery; during the same year, he was a Clinical Instructor for the UAB Department of Restorative Dentistry. He completed his three-year orthodontic residency program and received his Master of Science degree and his Certificate in Orthodontics from the UAB School of Dentistry.

Dr. Johnston returned to Atlanta and opened his orthodontic practice in Marietta. In 2001, Dr. Johnston earned his Board Certification from the American Board of Orthodontics. Only 25% of the orthodontists in the United States are Board Certified.

Dr. Johnston is committed to furthering the future of Orthodontics with his involvement in several dental councils and organizations:
  • Georgia Association of Orthodontists
  • American Dental Association
  • Georgia Dental Association
  • Hinman Dental Society
  • Pierre Fauchard Academy
  • College of Diplomates of the American Board of Orthodontics
  • American College of Dentists
  • International College of Dentists
  • Midwest Component of the Angle Society.

Life Outside the Office

Dr. Johnston is very active in his local community. He has been a Partner in Education for Sope Creek Elementary School, Dodgen Middle School and Dickerson Middle School. Other areas of his involvement include:
  • Dental mission trips with churches to Peru, Mexico and Honduras.
  • Eagles Nest- an Atlanta inner-city mission for the homeless.
  • Rainbows- an international organization designed to assist children and adults who have experienced loss of a loved one from death or divorce.
  • Rotary Club of East Cobb
  • Citizens Advisory Committee for surrounding public schools.
  • Baseball coach

Dr. Johnston resides in Atlanta with his wife, Helene. They have three daughters, Taylor, Chandler and Bailey and one son, Watts. They have two dogs, Pearl and Greta; and two cats, Gary and Lila, two granddogs and one grandcat! Dr. Johnston enjoys many hobbies, including hunting, fishing, jogging, boating and enjoying the North Georgia Mountains with his family.

Why Choose Us

Our goal at Johnston Orthodontics is to create beautiful, healthy smiles for our patients that will be valued for a lifetime!
  • Leading edge orthodontic care with traditional braces, clear ceramic braces, and aligner therapy
  • Dr. Johnston is a Board Certified Orthodontist that works closely with your general dentist and encourages routine dental care as well as good oral hygiene at home.
  • Flexible scheduling!
  • Affordable treatment options with flexible no interest payment programs available.
  • We accept direct payment for most insurance plans.
  • We communicate openly with our patients!
  • Safety and comfort are of the utmost importance in our practice. Our sterilization procedures brings a whole new level of protection to our patients. We deliver the highest standard of sterilization in dentistry.

Our mission is to provide optimal orthodontic treatment using the most current and proven techniques in our field. We want to help achieve optimal treatment goals while keeping the patient’s best interest foremost.

We are committed to listening to our patients’ desires before giving educated and honest opinions. All patient care rendered will be as if rendered to ourselves. We will strive for our office to be known for our professionalism and excellence. In short, our office will continually strive to be the hallmark of professionalism, orthodontic excellence and patient care.

Our Locations

We are a family-oriented, single doctor owned, private orthodontic practice, serving East Cobb Marietta and Sandy Springs. We specialize in personalized care with state of the art technology and the most advanced digital scanning capabilities . We treat orthodontic problems and improve smiles using both Aligner therapy and traditional braces.

Office Tour

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