Our Team
The friendly and experienced staff at our Periodontic clinic in River Forest (just outside of Chicago) are focused on making your experience a great one.
- Building construction utilizing reclaimed materials.
- Low Energy LED lighting thru-out.
- High SEER rated climate control.
- Dyson certified hygienic air purification and hygiene products.

Constantine Politis DDS
Dr. Politis is a graduate of Loyola University’s School of Dentistry, where he completed postgraduate studies in Periodontics. He then served as Director of Undergraduate Clinical Periodontics.
He has lectured locally, nationally and internationally and is a member of several professional organizations. He has earned his fellowship in the Academy of General Dentistry.
Dr. Politis is past-president of the Illinois Society of Periodontist, Hellenic American Dental Society, Chicago Dental Society West Side Branch and served as both an executive board member and editor for the Mid-West Society of Periodontics.
He is actively engaged in the full-time private practice of clinical Periodontics in River Forest, Illinois.

Bradley S. DeGroot DDS
Dr. DeGroot is a graduate of Marquette University School of Dentistry. He then completed a residency at the University of Texas Health Science Center San Antonio where he earned a certificate in the specialty of periodontics and was awarded his Masters of Science degree for research on surgical techniques to improve implant cosmetics.
Dr. DeGroot has been an active member of the dental community. He is the current president-elect of the Illinois Society of Periodontology and is an active member in national and local dental organizations. He has continued to publish articles, textbook chapters, and to lecture nationally and internationally on implant protocols, bone grafting procedures, and interdisciplinary treatment. Dr. DeGroot maintains a full-time private practice where he is passionate about providing the most predictable and personalized care for the patients he is privileged to work with.
When not practicing dentistry, Dr. DeGroot enjoys spending time exploring Chicago with his wife and son.

Bernadine Sullivan
Bernadine Sullivan received her dental assisting certification from Loyola University’s School of Dentistry. She then worked in Loyola Hospital’s general practice residency before returning to the dental school to obtain her dental hygiene degree and complete her undergraduate studies. Bernadine has been providing her gentle and caring services as a team member since 1995.

Dianne Diaz
Dianne Diaz has been serving our patients administrative needs since 2006. She is an expert in aiding our patients with their financial and insurance needs. Dianne is fluent in Spanish.

Nadiya Danilevich
Nadiya Danilevich joined our team in 2014 and has been an integral member ever since. After 7 years of assisting at an endodontic specialty practice she brought her excellent assisting skills to our team. Nadiya is fluent in Ukrainian, and speaks Polish and Russian.