Here at Commonwealth Dental Group, we believe that a smile tells a thousand words, and we are dedicated to giving our patients high-quality dental care. We offer a full range of dental services, so all of your family's needs are met under one roof.

Our goal is for you to leave our office with a memorable and enjoyable dental experience, which is why our welcoming and compassionate staff will do everything they can to make you feel right at home.

If you are looking to brighten and enhance your smile, please don’t hesitate to contact us today at (617) 266-8770!

Dr. Mark Mizner

Dr. Mark Mizner is a 1980 graduate of Tufts School of Dental Medicine. In his more than 30 years of practice, he has developed a reputation for putting his patients at ease while delivering high-quality cosmetic and restorative dentistry.

Dr. Mizner is an active member of the American Dental Association, Massachusetts Dental Association, Academy of Dental Science, and several other professional organizations and honor societies. He has been involved with the Yankee Dental Congress since 1985 and has served as Chairman of numerous committees including the prestigious Scientific and Allied Scientific Committees. In 2005, Dr. Mizner was honored with the Massachusetts Dental Society’s Volunteer Hero Award.

Dr. Mizner lives in Weston with his wife Amy and their two daughters, Dylan and Jillian. In his spare time, he enjoys skiing, scuba diving, and music, and is an avid Red Sox and Celtics fan.

Dr. Tina Giannacopoulos

Dr. Tina Giannacopoulos received her dental degree from Boston University, summa cum laude, and was inducted into the OKU Omicron Kappa Upsilon Honor Society.
Dr. Giannacopoulos holds her Bachelor of Science degree from the University of Alberta, where she was a scholar athlete in soccer and named an Academic All-Canadian. She is also a recipient of the Johnny Bright Award.
Currently, Dr. Giannacopoulos is a member of the Massachusetts Dental Society and American Dental Association. She was a recipient of the Best of Boston 2018 Award.
Patients trust Dr. Giannacopoulos’ expertise because she consistently provides high quality care that leads to positive and lasting health outcomes.

Dr. Andrew Tonelli

Dr. Andrew Tonelli is a cum laude graduate of Tufts University and a graduate of Tufts University School of Dental Medicine. While at Tufts, Dr. Tonelli served as his class president. He was the recipient of the Class of 2002 Prize for Peer Support and Leadership, the American College of Dentistry Outstanding Student Leader Award, the International College of Dentistry Leadership Award, and the Joseph R. Evans Award for Clinical Operative Dentistry. In recognition of his work in the Dominican Republic and Haiti, Dr. Tonelli was inducted as a member of the Honos Civicus Society. This honor society celebrates students who demonstrate an exceptional commitment to community service and civic engagement. He completed a general practice residency at New York Presbyterian Hospital and Cornell-Weill Medical Center in New York City.

Dr. Tonelli is a member of the ADA and Massachusetts Dental Society and maintains membership in the Tufts University School of Dental Medicine Alumni Association. Dr. Tonelli is conversational in Spanish and welcomes Spanish-speaking patients.

In his free time, Dr. Tonelli is an avid skier and a lover of all things outdoors. This especially includes mountain biking and time spent with his dog, Rafferty.

Dr. Panos Papaspyridakos

Dr. Panos Papaspyridakos is a specialist Prosthodontist and his clinical expertise covers all aspects of Implant, Esthetic and Reconstructive Dentistry. He received both his Certificate of Specialty in Prosthodontics and M.S. degree with honorary distinction from Columbia University College of Dental Medicine. Subsequently, he received his Certificate of Fellowship in Implant Dentistry from Harvard School of Dental Medicine. He also holds a D.D.S. degree from the University of Detroit Mercy School of Dentistry and a Ph.D. degree from the National University of Athens School of Dentistry.

Currently, Dr. Papaspyridakos serves as an Associate Professor of Postgraduate Prosthodontics at Tufts University School of Dental Medicine and as an adjunct Associate Professor of Prosthodontics at the University of Rochester Eastman Institute for Oral Health, and he maintains a part-time private practice limited to Prosthodontics and Implant Dentistry in Boston, MA.

Dr. Papaspyridakos has published more than 100 articles and abstracts in international, peer-reviewed journals and has authored book chapters in 5 Implant Dentistry textbooks, while he serves as reviewer for several dental journals. His innovative clinical implant research has received international acclaim with educational awards and is well cited with more than 2,500 citations. He is a fellow of the International Team of Implantology (ITI) and the Greater New York Academy of Prosthodontics (GNYAP) and he lectures extensively on dental implants and esthetics in national and international dental meetings.

Meet the Team


Lisa T.
Lisa graduated from Forsyth School for Dental Hygienists in 1986 and began working full time for Dr. Mizner in 1993. After taking a couple of years off to start a family, she rejoined CDG on a part-time basis in 1996.

Lisa currently resides in the North Shore with her husband and four children.

Jenna started working for CDG in the fall of 1999 after graduating from Forsyth School for Dental Hygienists. She is a member of the American Dental Hygienist Association and the Massachusetts Dental Hygienist Association.

Jenna loves New England’s four seasons and especially enjoys following each local sports team during theirs!

Betsy graduated from Forsyth in 1995 and earned her B.S. from Northeastern University in 2001. She has worked at CDG for the past 18 years.

Betsy is married with two children. She loves to travel and spend time with her family. She especially loves to watch them play sports.

Maureen started working at CDG upon her graduation from Forsyth in 2002 where she earned her B.S in Dental Hygiene. She has volunteered with Team Smile, a non-profit that teams dental professionals with professional sports organizations to provide dental care to underserved children.

Maureen enjoys living in the city, walking to work, traveling, and running.

Linda is a graduate of Forsyth School for dental hygiene and has worked for CDG since 1994. Her favorite part of being a hygienist is the personal relationships she forms with her patients.

Linda is an avid New England Patriots fan. In her spare time loves to travel and spend time with her husband and two children.


Toni is a 1995 graduate of the Mount Ida College Dental Assisting program. She has worked as a dental assistant for 21 years and for CDG for 16 years. She excels at making sure patients are as comfortable and relaxed as possible in the dental chair.

In her spare time, Toni enjoys traveling, going to the movies, and shopping.

Marvela has worked as a dental assistant since her graduation from the Bryman Institute in 2003, joining CDG nine years ago. Aside from her assistant duties, she is also responsible for ordering all the dental supplies in the office.

Away from the office, Marvela enjoys spending time with her large, extended family and two children.