Iowa City and Coralville Orthodontist

Meet Dr. John Mergen! Our orthodontist in Iowa City and Coralville, IA, is devoted to creating amazing “Mergen Orthodontics Smiles.” His signature smiles are said to change the lives of his patients. He is known for his dedication to providing patients with exceptional service and advanced clear options that always exceed their expectations.

Our orthodontist creates a fun, relaxed environment where patients love to visit. The treatment options that Dr. Mergen offers are less obtrusive (clear) and he operates in an efficient manner in order to make orthodontic treatment short and sweet.

Dr Mergen Orthodontist

Top 1% VIP Diamond Plus
Invisalign Orthodontist

Dr. Mergen has dedicated his career to providing the most advanced orthodontic care and service for his patients. He specializes in Invisalign®, which is the most advanced technology in orthodontic care. He also provides Invisalign treatment for all ages, earning him the Top 1% VIP Diamond Plus provider status in North America.

Comprehensive Patient Care

For Dr. Mergen, orthodontic treatment is about so much more than just straighting teeth. Dr. Mergen is dedicated to complete patient care including proper jaw and facial growth, airway development, ensuring there’s enough room for permanent teeth, achieving a stable bite, maintaining a balanced TMJ relationship, aligning teeth, and, of course, creating an amazing smile.

Background and Education

Dr. Mergen’s interest in orthodontics started in high school when he made retainers in his father’s orthodontic practice. He was so excited about the field of orthodontics, he committed to an accelerated three-year honor program at the University of Iowa College of Dentistry. He earned his Doctor of Dental Surgery from the University of Iowa in 1995, graduated with honors, and was second in his class of 87 students.

Then, Dr. Mergen accepted 1 of 5 spots into the top orthodontic graduate program in the country at the University of Iowa College of Dentistry and earned his master’s degree in 1997. Dr. Mergen is dedicated to advancing orthodontic care and service for his patients. He has a specialized interest in Invisalign orthodontics, earning him the Top 1% VIP Diamond Plus status.

Academic Awards

  • Omicron Kappa Upsilon Honor Dental Society
  • American Academy of Esthetic Dentistry Student Award
  • American Academy of Prosthodontics Dentistry Student Award

Professional Associations

  • American Dental Association
  • American Association Of Orthodontists
  • Midwestern Society Of Orthodontists
  • Iowa College Of Dentistry

Professional Publications


“Treatment outcomes of growing Class II Division 1 patients with varying degrees of anteroposterior and vertical dysplasias, Part 2. Profile silhouette evaluation.” American Journal of Orthodontics & Dentofacial Orthopedics 125 (4): 457-462, 2004.


“Evaluation of profile esthetic change with mandibular advancement surgery,” American Journal of Orthodontics & Dentofacial Orthopedics 117(6), 2000.

Case Publication

“Treatment of a Class III malocclusion with maxillary constriction and an anterior functional shift.”

This case was chosen by the CDABO student case selection committee for publication in the AJO/DO.

(Am J Orthod Dentofacial Orthop 1999;116:324-8).

Outside the Office

Dr. Mergen loves having fun and spending time with his wife and two boys. His favorite sports are windsurfing, surfing, kiteboarding, wakeboarding, boating, snowboarding, and snowmobiling.