Dental Staff

Dental Staff St. Charles, IL

All our professionals at John Isbrandt, DDS, PC maintain the highest levels of accreditation and pursue ongoing continuing education to stay abreast of the latest advancements in the dental field.


John Isbrandt, DDS


Dr. Isbrandt graduated from North Central College in Naperville, IL in 1982 with a B.A. degree in Biology.  He then went on to attend the University of Illinois at Chicago where he received his Doctor of Dental Surgery (DDS) degree in 1986. 

After graduating from dental school, he enlisted in the U.S. Public Health Service where he practiced dentistry with underserved populations in the United States for more than four years.  In addition to his general dental license, Dr. Isbrandt has had extensive training in orthodontics including Invisilign, implantology and endodontics.  He also had training on seperate occassions at the Mayo Clinic in Rochester, MN and completed an externship at the U.S. Naval Hospital in Bethesda, MD. 

Dr. Isbrandt started his first dental practice in 1992 in Bartlett, IL.  After 6 years, he transitioned his practice from Bartlett to St. Charles, where the practice is currently located.  Dr. Isbrandt enjoys performing all aspects of dentistry, but he particularly enjoys doing cosmetics, orthodontics and Cerec (single visit crown) restorations.

Dr. Isbrandt resides in Campton Hills with his wife and has three grown children.  When he's not practicing dentistry, he enjoys playing golf, hiking, snow skiing and biking.



Office Coordinator

Mary has been with our practice since August, 2009.  She has over a decade of experience working in the dental field.  She truly enjoys working in a positive and comforting work enviroment and strives to provide every patient with an amazing experience in our office.  She and her husband have resided in Elgin all their lives and raised their four children there, as well.  In her free time, Mary enjoys spending time with her seven grandchildren.  She also enjoys going camping with her family, friends and English Retriever, Major.



Dental Assistant

Karen has been working chairside as Dr. Isbrandt's dental assistant since 2004.  However, she has been working in the dental field since 1987.  Karen always has a smile on her face and truly enjoys getting to know each and every patient.  Karen's goal is to make sure every patient has a great experience and that their expectations are met.  In her free time, Karen enjoys spending time with her family and likes to garden too.




Dental Hygienist

Erin has been a dental hygenist with Dr. Isbrandt's office since graduating in 2006.  Having grown up in St. Charles, she decided to move back to the area after completing her BS degree in Dental Hygiene at East Tennessee State University.  Erin's kind disposition and vast dental knowledge allows her to give her patients the ultimate care.  In her spare time, she helps care for her grandparents, enjoys reading books and playing with her airedale terrier puppy named Sadie.




Dental Hygienist

Gaby has worked in the dental field since 2009.  She graduated from College of Dupage with a dental hygiene degree in 2014.  Gaby resides in Elburn with her daughter, Chloe and her other daughter, of the four-legged type, a malinois named Lola.  Gaby's quick wit and enthusiam makes for an enjoyable dental hygiene visit.  She enjoys cooking and reading the occasional book, although, Gaby will admit to turning on the tv quicker than she will turn the pages of the latest novel. 




Dental Hygienist

Michelle graduated from Marquette University in 1990 with a bachelors degree in dental hygiene.  She has been practicing hygiene in the Fox Valley area for the past 18 years.  The most enjoyable part of Michelle's job is building a great relationship with her patients.  She finds that creating trust, as well as providing valuable education is of the utmost value.  She stays active in her spare time with family and friends and enjoys cross training, reading and traveling.