Seth Thomas Barnett, DMD, MS

The team at Endodontic Specialists is led by Seth Thomas Barnett. He was born and raised in Bloomington, IL and is overjoyed to return home with his family to serve our community! In 2020, Dr. Barnett purchased Endodontic Specialists, previously lead by Dr. Sieraski, who is known in the community for providing high-quality care. Dr. Barnett is excited to continue this tradition of excellence and is eager to care for you!

Dr. Barnett is a lifelong learner and provides the highest quality and evidence-based care. He stays up to date with the latest literature and utilizes technologies that allow your treatment to be more predictable, comfortable, and successful. Technologies include operating microscopes, 3D CBCT imaging, ultrasonic instrumentation, and the highest levels of infection control, to name a few. He is currently board eligible with the American Board of Endodontics and is actively pursuing board certification. During his time at The Ohio State University, he took advantage of the renowned program and its focus on local anesthetic delivery to insure the most comfortable root canal experience.

From the start of his educational and professional career, Dr. Barnett has been involved in organized dentistry. He has actively engaged with our state legislature to insure they are educated about our community’s dental and overall health as they make legislative decisions. He also served his dental school by playing a part in insuring the highest level of professional ethics.  With the community’s best interest in mind, he is looking forward to being active in the local McLean County Dental Society.

During his free time, he spends time with his wife, Carli, and his growing family. He also enjoys hiking, cycling, photography, and generally spending time outdoors. 



The Ohio State University – Master of Science and Endodontic Specialty Certificate (MS)

Southern Illinois University School of Dental Medicine – Doctor of Dental Medicine (DMD)

University of Illinois at Urbana-Champaign – Bachelor of Science (BS)

Normal Community West High School

Awards and Distinctions

American Association of Endodontists Student Achievement Award in Endodontics                                                 

  • Nominated by faculty as the sole recipient for both academic and clinical achievements

Induction in Omicron Kappa Upsilon National Dental Honor Society                                                                             

  • Nominated by active faculty members of SIU-SDM based on character, after meeting academic eligibility requirements

American Academy of Implant Dentistry Certificate for Outstanding Achievement

  • Recommended by SIU-SDM as the sole recipient for both academic and clinical achievements

Delta Dental of Illinois Recognition as an Outstanding Dental Student                                                                          

  • Awarded scholarship based on demonstration of service and commitment to oral health in Illinois

Dr. Walter E. Dundon Award for Clinical Excellence and Leadership

  • Selected by the Odontographic Society of Chicago as sole recipient among senior class

Southern Illinois University School of Dental Medicine Dean’s Scholarship

  • Selected through competitive application and interview process based on criteria including character and academic success

Southern Illinois University School of Dental Medicine Magna Cum Laude

  • Distinction given for academic honors

University of Illinois Highest Honors

  • Distinction given for academic honors

Eugene G. Mosbacher Scholarship Recipient

  • Awarded scholarship from UIUC private donor


  • American Association of Endodontics
  • McLean County Dental Society
  • Illinois State Dental Society
  • American Dental Association
  • Delta Sigma Delta Dental Fraternity