At American Dental Excellence, we’re all about teeth. Well, not just any teeth – your teeth. And your gums. And your overall oral health. In fact, we’re pretty much nerds when it comes to dental healthcare and we’re pretty darned proud of that. We believe that it is this passion for dentistry, in all of its forms, that drives us to maintain our high levels of customer care and procedural excellence in all that we do. Led by Dr. John Montoya, our staff has exemplified expertise in dentistry, delivering a level of patient care that is rarely seen in the industry. We’re just dedicated to delivering compassionate, caring, exemplary service. And it shows.


Dr. Montoya – Dentist

Driven by the belief that health care decisions should be left in the hands of the patients themselves, Dr. John Montoya provides exemplary, patient-focused dental care for all of Westminster and its surrounding areas. As a biology graduate of the University of San Diego, afterwards receiving his doctorate degree from Creighton University, he brings his extensive education and experience to his own dental clinic in Westminster.

After hours, Dr. Montoya is dedicated to both his family and his community. Spending hundreds of hours volunteering for a variety of non-profit organizations, he has committed his free time to help out in a variety of ways, from fundraising for breast cancer research to donating his services to ensure high-quality dental care to those in need.


Dr. Michael Harkins – Dentist

Michael Harkins is a recent graduate from the University Of Mississippi School Of Dentistry. he relocated to Denver, CO with his wife, Claire, to practice General Dentistry.

Dr. Harkins’ main drive in dental school came from patient satisfaction. With that, he feels that it is very important to fully pay attention to what the patient wants, and base treatment planning around what they say. He is very particular to providing the best quality of dentistry possible while the patient is in his chair. His treatment modality goes along with the Golden Rule, which is to treat his patients how he would want to be treated.

In his free time, Dr. Harkins generally enjoys being outside. His hobbies include playing as much golf as he can, exploring new trails to hike around Denver, and spending time with his wife, Claire, and his dog, Rooney.


Gina Welihan – Office Manager

Gina Welihan has worked in administrative front office roles since 2006. She loves the opportunity to work with patients on reaching their dental health goals. Gina is a Colorado Native and, in her spare time, she loves participating in rock crawling and off-road events with her husband and daughter.



Linda – Hygienist

Linda graduated as a Registered Dental Hygienist from The Community College of Denver in 2015. She has also worked as a dental assistant and has gained a well rounded knowledge of the dental field.  Linda enjoys educating her patients about the benefits of preventative care. In her free time, Linda enjoys backpacking, rock-climbing, snowboarding and reading.


Margaret – Dental Assistant

Margaret has enjoyed being in the dental field for over ten years. She and her husband have a blended family with four children total. Outside of the office, Margaret enjoys camping, traveling, and simply being together with her family. Margaret’s hobbies include scrap booking and crafts, photography, and genealogy.