Our Team

Young girl at the dentist

Meet Our Team

Experienced Dentist in Herrin, IL

We’re here to serve you! At the office of Donald G. Guebert, D.M.D. our friendly and dedicated team cares deeply about making sure you have a positive dental experience with us at every visit and that your needs and goals are being met. Whether you’re here for a routine cleaning or are getting a whitening treatment, our talented team is with you every step of the way.

For more information about us, or to schedule an appointment, please feel free to contact us today. We can’t wait to welcome you to our practice!


Donald G. Guebert, Dentist in Energy, IL

Donald G. Guebert, D.M.D.

Dr. Guebert is a native of Steeleville, IL and a graduate of Southern Illinois University School of Dental Medicine. Prior to dental school he received his bachelor’s degree in biology from the University of Illinois. Dr. Guebert and his wife Barb chose to make Herrin their home because their roots run deep in Southern Illinois. “Southern Illinois is a great place to live and we are happy that our kids grew up near their grandparents, aunts, uncles, and cousins.”

Growing up in a family of five boys, Dr. Guebert recalls always being busy with basketball and baseball teams. That connection has stayed a large part of his life. His favorite pastimes remain a variety of sporting activities with his family. He stays active in sports by keeping score and statistics at the Herrin High School football and boys and girls basketball games. He also enjoys spending time hunting and taking care of his lawn.

As a dentist, Dr. Guebert is thankful that he can make a difference in his patients’ lives. “I love helping people achieve smiles that are healthy, functional, and beautiful. I am extremely honored to know that my work can be life changing for someone; whether it is relieving pain or anxiety, allowing someone to smile with confidence, or simply helping someone to enjoy eating again.”

Dr. Guebert is a member and former president of the Southern Illinois Dental Society. He is also a member of the Illinois State Dental Society, American Dental Association, Pride Institute of Dental Practice Management, and GROWS Implant Study Group.
Dr. Guebert has a strong commitment to staying up-to-date with the newest advances, technologies, and changes in the world of dentistry. Because dentistry is a field that is constantly changing and developing, Dr. Guebert and his team frequently attend continuing education courses and conferences.


Deanna, Registered Dental Hygienist at Donald G. Guebert, DMD


Registered Dental Hygienist

Deanna’s favorite part about being a hygienist is getting to know her patients and helping them improve their smile. “The most exciting part of dentistry for me deals with aesthetics. Teeth whitening, all-porcelain crowns, veneers, and bonding can dramatically improve a person’s smile.” Deanna enjoys spending her free time with her family, caring for her pets, and enjoying the summer sun.

Jen, Registered Dental Hygienist at Donald G. Guebert, DMD


Registered Dental Hygienist

Jen’s outgoing personality is just what our patients need to feel comfortable and motivated to take care of their smile. “I’m a people person at heart so I naturally enjoy the time spent getting to know our patients and making them feel at home. It is great catching up with our patients at their recall visits while still providing a valuable service.” Most of Jen’s free time is spent with activities involving her three amazing daughters.

Nikki, Administrative Assistant at Donald G. Guebert, DMD


Administrative Assistant

With her workplace near the welcoming window, Nikki is likely to be the first one who greets you as you enter our office. She enjoys being able to provide conveniences to our patients, such as the email and text communication system. “I always try to schedule appointments that are efficient and convenient for our patients’ personal schedules.” Nikki and her husband stay busy with their daughter and son. She loves being an active mom; whether she is coaching her daughter’s softball team, traveling to and from dance or gymnastics, or playing trucks and dinosaurs with her son.

Karen, Dental Assistant at Donald G. Guebert, DMD


Dental Assistant

Karen’s outgoing and talkative nature puts her patients at ease while visiting our office. One of her favorite things about dental assisting is being able to form relationships with patients of all ages. She says helping them feel comfortable with their smile is an added bonus! “I enjoy talking with and learning about each patient we see. Having dental work done can be nerve wracking sometimes, so I do my best to keep our patients calm and relaxed.” When she’s not at work, Karen can be found enjoying the outdoors with her husband and 2 boys at baseball games, spending time with her mom or out shopping.

Crysta, Dental Assistant at Donald G. Guebert, DMD


Dental Assistant

With many years of experience in dental assisting, Crysta has come to love helping patients overcome their anxiety toward dental procedures. As the go-to-person for Cerec CAD/CAM design in our office, Crysta is passionate about the conveniences of single visit dentistry. “The idea that a person can have a new crown in just one appointment with no gooey impressions and no temporary crown is just amazing. Our patients love it!” Crysta and her husband have three beautiful children and a new grandchild. If Crysta is not snuggling with her grandbaby, she can be found either shopping, living the outdoor life, or spending time at the lake with her family.

Barb, Office Manager & Treatment Coordinator at Donald G. Guebert, DMD


Office Manager & Treatment Coordinator

As the office manager, Barb spends most of her day “behind the scenes” taking care of business operations and making sure that the office runs smoothly. She is happiest though when she spends time with our patients. “In my role as treatment coordinator I enjoy listening to our patients and then discussing with them all of the available treatment options so that together we can create a customized plan that is right for them.” She and Dr. Guebert are married and have three children. In her time away from the office she loves doing home improvement projects, quilting, gardening, and spending time with family and friends.