dr mark medder dmd o'fallon il

Local Dentists in O’Fallon Illinois!

dentist o'fallon il

Welcome to Mark Medder DMD! Our dentists are committed to providing our patients the best dental care in the O’Fallon, Illinois area! We are family-owned and operated and have been helping the local community with their dental needs for over 20 years! We provide many treatment options from cleanings to cosmetic bonding. We accept most insurances and are a United Concordia & Delta Provider.

We welcome new patients to our office and promise that your visit will be comfortable. We also work around your schedule. As well as our regular office hours, we do have evenings and Saturday appointments available upon request. If you have any questions, give our office a call!

Cosmetic Bonding

Our cosmetic dental care services are the best in the area! Customized to our clients needs, you’ll be sure to have a smile that you love.

Preventative Dentistry

Maintain your oral health with regular dental check-ups. We can also help you maintain the health of your gums, and prosthetic teeth.


If you are experiencing pain from damaged or decaying teeth – dental crowns can help with tenderness and are the healthiest alternative.

Root Canals

If you have an infected tooth, count on Dr. Mark Medder to fix it by performing a root canal and restoring your oral health.

Nitrous Oxide

For more sensitive procedures or for our nervous patients, we do offer Nitrous Oxide to ensure that you’re more comfortable during your visit.

Complete & Partial Dentures

Whether you need a sparkling new set of teeth or just partials, we have the best denture options in St. Clair County.

About Our Office

Feel free to call and schedule an appointment with us! Our office is open Monday through Friday between the hours of 8am and 5pm. We are also available in the evenings and have Saturday availability upon request. We have been providing outstanding dental care for over 20 years. You can count on us for general, cosmetic and preventative dentistry! If you are looking for one the best dentists with experience in all area, please give us a call! We are happy to accept new customers and take most insurance.

Our Office


Phone Number

Business Hours

mark medder dmd dentists office o'fallon il

Insurances We Accept

We accept the following insurance: