124 East Lincoln Ave. Fergus Falls, MN 56537


Grant R. Colling, DDS

Grant R Colling, DDS

Our Team

Grant Colling, DDS

Dr. Colling received his Doctor of Dental Surgery degree from Creighton University, Boyne School of Dentistry in 1981, graduating with honors.

After graduation, Dr. Colling began his private practice in Fergus Falls.

Dr. Colling has studied extensively at The Dawson Center for the Advancement of Dentistry and The Pankey Institute for Advanced Dental Education in the areas of restorative and implant dentistry, TMJ diagnosis and treatment, obstructed sleep apnea, and other related airway issues.

In pursuing his passion to deliver the best treatment in a comfortable and relaxing setting, Dr. Colling participates in two Pankey Affiliated Learning Group study clubs. He also has been a member of the Heartland Study Club, having been a restorative advisory board member for many years. The Heartland Study Club has honored him with the awards for Clinical Excellence in 1996 and 1999, Outstanding Clinician of the Year in 1997, and Outstanding Clinical Presentation in 2002.

Dr. Colling is married to Mary Ann and has three sons. He enjoys cooking real food, photography(of many genres), mowing his lawn in straight lines, and maintaining optimal health through weight lifting and power yoga.

Mary Ann Colling

Meet Mary Ann, she is the voice of Riverfront Dental. From greeting you on the phone or in person, she will make your visit at Riverfront Dental feel like home. With degrees in Education and Psychology Mary Ann is able to facilitate the relationship between patient and provider.

Since her career change in 1988, Mary Ann has seen many changes in Dentistry. She has kept Riverfront Dental on the cutting edge of technology, implementing many systems and has been a vehicle in supporting the relationship between dentistry and whole body health. Keeping in touch with individualized care is always a goal. Aside from her profession, her passion is her family. Husband Grant and sons Ian and Aidan keep her smiling.

Mary Ann enjoys a healthy balance in life. She enjoys yoga, cooking, working in gardens, walking her dog Eva and enjoying every season on Marion Lake with friends and family.

Jacki Hahn-Rubish, RDH

Jacki joined our team in 1989 shortly after graduating from NDSCS in Wahpeton, ND. She likes to say she grew up at Riverfront Dental. She enjoys the relationships she has formed with patients over the years. She is caring for the 4th generation in some families.

Helping patients help themselves is one of Jacki’s greatest joys. She is committed to helping patients improve their oral health; making it possible to improve their overall health.

Outside of work, Jacki enjoys reading, quiet walks and bike rides, learning more about perennials as she is landscaping her house and riding motorcycle, but only as a passenger. Jacki and her husband Dale have been married for more than 25 years and have three beautiful daughters.

Katrina Dahlgren, RDH

Katrina is from Breckenridge, MN. She graduated from NDSCS of Wahpeton, ND in May of 2017 with an Associate’s Degree in Dental Hygiene. She has been with us since July of 2017 and feels blessed to work with people who are so motivated and experienced. In her free time she enjoys being at the lakes, going to any type of sporting events, participating in volleyball leagues, being an active member of her church group and spending time with her friends, family and dog.