Dedicated To Excellence
Great Smiles To Last A Lifetime
Experienced Dental Care

Contact Us!

We encourage you to contact us with any questions or comments you may have. Please call our office or use the quick contact form below.

Office location:
2934 Highway K
O'Fallon, MO
Phone: 636-379-6905

Thank you for choosing Periodontics of O'Fallon for your periodontal and implant needs. Our community has been through a lot over the last few months, and all of us are looking forward to resuming our normal habits and routines. While many things have changed, one thing has remained the same: our commitment to your safety.

Our of office follows infection control recommendations made by the American Dental Association (ADA) the U.S. Centers for Disease Control & Prevention (CDC) and the Occupational Safety & Health Administration (OSHA). We follow the activities of the agencies so that we are up-to-date on any new rulings or guidance that my be issues.

Changes you will see when it is time for your next appointment to help protect our patients & staff:

  • When you arrive for your appointment, we ask that you call us (636) 379-6905, from your car to let us know you have arrived and we will let you know when  your provider is ready for you.
  • We ask that you wear a mask when you enter the office, and use the hand sanitizer that we have provided for you.
  • You'll be asked some screening questions and your temperature will be taken.
  • Appointments will be managed to allow for social distancing between patients. That might mean that you're offered fewer options for scheduling your appointment.
  • We will do our best to allow greater time between patients to reduce waiting times for you, as well as to reduce the number of patients in the reception area at any time.

We look forward to seeing you again and are happy to answer any questions you may have about the steps we take to keep you, and every patient, safe in our practice. 


Dr. Sarah Northcott & Team 

Board Certified Periodontist, Sarah Northcott, DMD, MS
Diplomate of the American Board of Periodontology

Healthy Smiles for Any Age

When you visit the office of Dr. Sarah Northcott, your smile is our top priority.  Our O'Fallon team is dedicated to providing you with the personalized, gentle care that you deserve. 

Dr. Northcott specializes in Periodontics and Implant Therapy.  We are here to help you achieve and maintain oral health, allowing you to smile with confidence! 


We focus on delivering the highest level of dental care in a caring and compassionate environment.  We genuinely care about our patients and we want to make sure they are given the personal care that they deserve.  To further ensure your comfort, Dr. Northcott offers a wide range of sedation options including nitrous oxide (laughing gas), and oral sedation.  Our services include Laser Periodontal Therapy and the use of 3-D cone beam CT scans.  We frequently add new technologies and procedures to ensure comfortable, predictable, and esthetic results.       


Our caring team members have decades of experience providing knowledgeable and compassionate care.  Our team understands that your journey may be an emotional one.  They will help to answer your questions and make you feel comfortable.   

Part of our commitment to serving our patients includes providing information that helps them to make more informed decisions about their oral health needs.  This website is a resource we hope you’ll find both useful and interesting.  We invite you to view our dental video library to learn more about dental implants and scaling and root planning.


We are proud to offer Laser Periodontal Therapy in the treatment of gum disease.  We also utilize detailed 3D cone beam CT scans for certain diagnostic purposes.  These are particularly helpful in dental implant surgery. 


Please feel free to call us at 636-379-6905 with any questions or to schedule a personal evaluation.  If your dentist or physician has referred you to our practice, we look forward to meeting you!  


Contact Us Today or Request An Appointment!

We genuinely hope this site is helpful to you in learning more about our practice, dental conditions and treatments, dental recommendations, and more.  The procedure section has many before and after photos of cases treated by Dr. Northcott; frequently with the help of our referring dentists. 

We are proud to offer services to people of O'Fallon, Wentzville, Lake St. Louis, St. Charles, St. Charles County, St. Peters, Chesterfield, St. Louis, St. Louis County, Troy, Mid Rivers, Warrenton and the surrounding areas.  We have also seen a number of patients from Illinois and the Greater St. Louis and St. Charles areas.

Please browse through our website and be sure to give us a call if you have any questions or would like to schedule an appointment.

Sarah Northcott, DMD, MS 
2934 Highway K
O'Fallon, MO 63368
Phone: 636-379-6905
Hours of operation:

Fridays are available only for large cases