Dedicated to your comfort

All of our staff is dedicated to your comfort and prompt attention.

Our goal is to keep your teeth healthy and your smile bright!


Marshall Gibbs, DDS

Dr. Marshall Gibbs, owns and operates Mint Conditional Dental. He grew up in Culdesac, Idaho, on a dry land farm and cattle ranch, where his enjoyment of outdoor recreation began.

Marshall graduated from the University of Idaho with a degree in Exercise Physiology. He earned his dental surgery degree from the University of Iowa. Marshall appreciates the Inland Northwest for its four seasons, easy-going lifestyle, and small communities. He enjoys motocross, snowmobiling, and spending time with his family and friends.

The mission of our practice comes out of Marshall's passion for serving smaller communities. At Mint Condition Dental, he loves meeting the dental needs of patients and their loved ones!

Location: Colfax

Sarah McDonald, DDS

Dr. Sarah McDonald hails from the great State of Washington and is very excited to have the opportunity to practice in Pullman. She entered the University of Washington School of Dentistry as the youngest member in her class and graduated with several awards. She is committed to providing comfortable, comprehensive and excellent care to her patients.

Keeping current on new developments in dentistry is important to Dr. McDonald. She dedicates much of her time to pursuing continuing education courses to ensure her skills and knowledge remain at the highest levels. Dr. McDonald is accredited by the American Academy of Facial Esthetics and a member of the American Dental Association and Washington State Dental Association. Last December, Dr. McDonald volunteered her time to restore the mouths of veterans and homeless in Arizona by placing implants. On the weekends you can often find her taking a course or volunteering. She loves to restore the smiles of all her patients to be healthy and bright!

Location: Pullman

Matthew Matta, DDS

Dr. Matthew Matta, born and raised in Spokane Valley, Washington, received his Doctor of Dental Surgery degree from Creighton University. He, his wife Jessie, and daughter Ellie were eager to move back home to be close to family and friends. During his free time, Matthew enjoys spending time with his family, playing golf, and enjoying all of the outdoor activities the Pacific Northwest has to offer.

Prior to his dental training, Matthew received his B.S. in Biology from Eastern Washington University and is grateful for having the opportunity to serve the this community and build lasting relationships with its members!

Matthew chose Mint Condition Dental because of a shared belief in providing exceptional dental care and education in a warm and comfortable environment.

Location: Cheney

Chelsea Keck, DDS

Dr. Chelsea Keck was born and raised in Spokane, Wa. After graduating from Gonzaga Prep high school, Dr. Keck went on to receive her Bachelor’s degree from EWU (GO EAGLES). Dr. Keck went on to live in various parts of the United States before being accepted into Creighton University School of Dentistry.

Before graduation, Chelsea was able to be a part of providing dental services to underserved communities. While she has enjoyed her time in areas such as the Midwest and East coast, she is more than excited to be back in Eastern Washington and her “old stomping grounds.” She looks forward to spending a lot of time with family again and being able to get in the car and drive to one of the many lakes surrounding this beautiful neck of the woods. Dr. Keck cherishes her French Bulldog, Pickle, who has added so much fun and laughter to her life.

Dr. Keck is pleased to have the opportunity to serve the wonderful community she calls “home". 

Location: Cheney