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. 

Sarah enjoys exploring new places and spent a month in Europe after graduating from dental school. On the weekends you may find her revelling in the outdoors of WA and hiking with family and friends.

Sarah is committed to providing comfortable, comprehensive and excellent care to her patients. Sarah dedicates much of her time to pursuing continuing education courses to ensure her skills and knowledge remain at the highest levels. She loves to restore the smiles of her patients to be healthy and bright!

Location: Pullman

Elizabeth Newell, DDS

Dr. Elizabeth Newell was born in Edinburg, Texas, and raised in South Texas and Houston. She comes from a family of dentists, her older brother is a general dentist and her younger brother an oral surgeon, both practicing in Texas.

Elizabeth loves the friendly staff she works with—they make her smile and laugh every day. Elizabeth enjoys exploring the beautiful hills, mountains, and forests of the Northwest with her husband Dane and their two daughters, Penelope and Norah.

What Elizabeth loves most about her patients is cultivating relationships based on trust, compassion, and understanding. She enjoys making people feel at ease. It's not uncommon to hear a few laughs coming down the hall from her room!

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 married her high school sweetheart, TJ, and went on to live in various parts of the United States before being accepted into Creighton University School of Dentistry.

Before graduation, Dr. Keck 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’s second love is her and her husband’s French Bulldog, Pearl, who has been a wonderful addition to the Keck family.

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

Location: Cheney

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