Thank you for choosing Periodontics of O'Fallon for your periodontal and implant needs. 

Dr. Sarah Northcott & Dr. Ida Zarrabi

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 optimal 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 to help them make more informed decisions about their oral health.  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 procedures such as 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. 

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 

Ida Zarrabi, DDS, MSD
2934 Highway K
O'Fallon, MO 63368
Phone: 636-379-6905

Hours of operation:






Fridays are available only for large cases

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.