Dr. Thomas C. Guernsey DDS


It is an honor to serve my hometown, building relationships while helping friends and neighbors achieve optimal oral and systemic health. I promise you will always be cared for as family: with compassion, skill, and the greatest respect for your individual needs.
Learn More about Dr. Guernsey

meetthe team

Our team members bring their extensive experience, dedication, and compassion to every interaction. With warmth, kindness, and a belief in putting your comfort and wellbeing at the forefront, they’ll help you enjoy a lifetime of beautifully healthy smiles.

yourfirst visit

Your first visit to Tri-County Dental Center is a chance for us to get to know you – and you to get to know us. We’ll review your medical and dental history, take X-rays, and then Dr. Guernsey will work with you to design a treatment plan for your healthiest smile.


Please arrive ten to 15 minutes early for your first appointment. This ensures there’s enough time to complete your paperwork and answer any additional questions.


Welcome to Tri-County Dental Center, LLC

Since 2006, Dr. Thomas Guernsey and his team have been honored to serve Fostoria and surrounding communities. Blending advanced dentistry with small town values, Tri-County Dental Center delivers exceptional care for lifetimes of beautifully healthy smiles.

Our practice goes above-and-beyond for our patient family, accommodating each person’s unique needs and designing treatment to achieve their goals. With warmth, skill, and compassion, we will help you and your loved ones achieve optimal oral health and smiles that ensure your personalities shine!

We offer routine, preventive, and emergency dental care for children and adults, providing:

Located in Fostoria, OH, Tri-County Dental Center serves communities in Hancock, Wood, and Seneca counties.

Dr. Guernsey and our team look forward to welcoming you to our family. It will be our honor to help your loved ones and you enjoy wonderfully healthy smiles, while building relationships that mean the world to us! Please, schedule an appointment, today!



Smiles are how we communicate, fostering trust and connections. With a bright, healthy, and beautiful smile, your confidence will shine!



Good home dental hygiene practices, healthy nutritional decisions, and regular checkups and cleanings will keep your smile functional and beautiful!



Functional, lasting, and designed to your unique bite, a crown is a restorative procedure used to strengthen a damaged or decayed tooth.



Dr. Guernsey provides high-quality, lasting restorations to improve oral health and function, giving you reason to smile!

I lost a crown on evening, and although I had to switch dentists a year ago D/T insurance, they got me right in the next day to re-cement my crown! Due to getting it put back in so quickly, I avoided unnecessary pain. Thank you! Sandra H
Very friendly staff and Dr. Guersney is amazing . I called at the last minute and they were able to work me in the schedule. I definitely found my new Dentist. Cindy R
They are the nicest staff. Dr. Guernsey's kind, patient, and cheerful disposition is a wonderful thing to have at the office. He takes the time so you don't feel like a number but a person. Thank you very kindly. rob B
American Dental Association Ohio Dental Association North Central Ohio Dental Association