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.

meet-dr-john-1montoyaAbout Dr. Montoya

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

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

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.


Cortney was born and raised in Colorado. She has been in dentistry since January 2016. She received her EDDA certificate in September 2016!!! What she loves most about being a dental assistant is getting to know the patients that come in and developing a relationship with them.

In her free time, she enjoys drawing and painting, spending time with family and friends, and getting the most out of the great Colorado outdoors.