Meet Our Motley Crew of Big Grins
Pediatric Dentists and Kid Experts

Your Big Grins Pediatric Dentists

All of our dentists bring extensive experience from working in hospitals. This not only elevates the level of care we provide, but distinguishes us as specialists in handling complex dental needs with ease and precision.

three dentist smiling at dentist office, graphic of girl jump roping

Dr. Rachel Ecker, DMD

Dr. Rachel Ecker, DMD

Dr. Rachel Ecker, a board-certified pediatric dentist and Fellow of the American Academy of Pediatric Dentistry. Growing up in Boulder, CO, she discovered her passion for dentistry during a mission trip to Haiti. She studied Psychology with a focus on infant and child development at Rhodes College in Memphis, TN, and earned her dental degree from Midwestern University in Arizona. Dr. Rachel completed her residency at Miami Children’s Hospital, where she specialized in special needs dentistry.

At Big Grins, Dr. Rachel emphasizes value-based care and the role of nutrition in pediatric dentistry. She is also involved in research projects and collaborates with the nonprofit Locally Haiti. Married to Dr. Sam Ecker, they have two children, Abby and Tom, and enjoy hiking, skiing, and quilting in their free time.

Dr. Marisa Werger, DMD

Dr. Marisa Werger, DMD

Dr. Marisa grew up in Fort Collins, where she attended Lesher Middle School and Poudre High School, participated in National Charity League, and danced at Canyon Concert Ballet. She went on to major in physiology at the University of Wyoming. During college she volunteered with Project Smile in Fort Collins, where she met Dr. Greg Evans. Together they went on to publish a paper in the Colorado Dental Association magazine and complete a dental service trip to Guatemala.

Following graduation from the University of Wyoming, Dr. Marisa was accepted to Harvard School of Dental Medicine. Thanks to her experiences with Big Grins she knew she wanted to specialize in pediatric dentistry. She then completed residency at Children’s National Hospital in Washington DC. During residency she gained experience in dental care for children with special healthcare needs and treating dental trauma. She is a member of the American Academy of Pediatric Dentistry.

Outside of work, Dr. Marisa still loves to dance and be active whether it’s at the studio, the gym or outdoors! She is married to husband Captain Ira Werger, who serves in the United States Army. Together they have three adorable dogs – ask Dr. Marisa about them next time you see her. 

Dr. Greg Evans, DDS

Dr. Greg Evans, DDS

Dr. Greg Evans, a board-certified pediatric dentist, founded his practice in 1998 and is one of the most experienced pediatric dentist in Fort Collins. He graduated with honors from the University of Iowa and completed his pediatric specialty training at the Children’s Hospital in Denver. Dr. Greg is passionate about infant dental care, mentoring, and teaching, he actively participates in community programs like Project Smile and ADA® Give Kids A Smile Day. Outside of work, he enjoys fly fishing, oil painting, and spending time with his family.

Your Big Grins Kid Experts

When you contact us, you’re not met with automated systems but instead, with our dedicated Big Grins Kid Experts. These experts are well-versed in children’s oral health at every developmental stage from infancy to young adulthood.


Office Manager


Financial Coordinator


Financial Administrator


Clinic Manager


Expanded Function Dental Assistant/OR Coordinator


Expanded Function Dental Assistant


Expanded Function Dental Assistant


Expanded Function Dental Assistant


Dental Assistant


Dental Assistant