Cornerstone Dental Group

About Cornerstone Dental Group

Cornerstone Dental Group is a Westford based family dentist practice that treats patients of all ages. We are committed to delivering the highest quality dental care and do so using advanced dental equipment. We are a cosmetic dentist that offers services like checkups, teeth cleaning, crowns, veneers and more.


We also perform emergency dentist services that include bonding, root canals, crowns, and bridges. As a local dentist, we create lifelong relationships with our patients and their families and work to ensure that they receive treatments in a comfortable and relaxed environment. Dr. Papapetros and our staff invite you to schedule an appointment by calling 978-364-3003 and experience why our patients think Cornerstone Dental Group is the best dentist in Westford.



Meet The Doctors


Nicholas T. Papapetros, DMD, FAGD

Nicholas T. Papapetros, DMD, FAGD

Dr. Papapetros has been delivering the highest quality dental care to his community since 1992. Originally from Quincy, Massachusetts, Dr. Papapetros earned his undergraduate degree in biology from Colby College in Waterville, Maine. He then went on to Tufts University School of Dental Medicine, where he earned his dental degree and student awards from both American College of Dentists and the American Association of Endodontists. After earning his dental degree Dr. Papapetros then completed a general practice residency at Lenox Hill Hospital in New York.

Dedicated to continuing education, Dr. Papapetros completed more than one thousand credit hours in continuing education courses and seminars since beginning his private practice. He has studied at such prestigious institutions as the L.D. Pankey Institute for Advanced Dental Education, the Las Vegas Institute for Advanced Dental Studies and Dawson Center for Advanced Dental Study. Dr. Papapetros is a Fellow in the International Congress of Oral Implantologists, International College of Dentists, American College of Dentists, and the Pierre Fauchard Academy. Dr. Papapetros is past President of the Tufts University School of Dental Medicine Alumni Association and the Merrimack Valley Dental Society.

Dr. Papapetros is an active member in many other leading dental and professional organizations, including: International Congress of Oral Implantologists, American Dental Society, Academy of General Dentistry, Massachusetts Dental Society, New Hampshire Dental Society, Merrimack Valley Dental Society, Greater Lawrence Dental Society, Tufts University School of Dental Medicine Alumni Association, and L.D. Pankey Foundation. In his spare time, Dr. Papapetros enjoys spending time with his wife, Andrea, and their four children: Theo, Isabella, Olivia, and Zachary.

Dr. Richard Lam DMD

Dr. Richard Lam DMD

Dr. Lam was born and raised in Boston’s South End. He graduated from Boston Latin and the University of Massachusetts’ Commonwealth Honors College of Amherst with a Bachelor of Science in Kinesiology. He would then earn his DMD from Tufts University School of Dental Medicine.

Dr. Lam's desire to help others who are less fortunate has been apparent in his involvement with Dentists for Humanity and Project Bridge. He has led multiple service trips to Haiti through Dentists for Humanity for three years in addition to volunteering for Project Bridge at local shelters in Boston for at-risk and homeless youth. He received the International College of Dentists Humanitarian Award in 2019 for his exemplified and demonstrated passion for altruistic humanitarian service.

He is an avid learner and enjoys taking continuing education courses, particularly in prosthodontics, complex restorative techniques, and aesthetic dentistry. He has taken courses in advanced surgical principles and implantology. He is an active member in the American Dental Association and Massachusetts Dental Society.

Dr. Lam is an outdoor enthusiast and especially loves camping and hiking in New England’s wilderness. He routinely participates in kickboxing, yoga, and Metcon training in Somerville, MA.

Dr. Lam will prioritize your autonomy and comfort while delivering uncompromising modern dentistry at every visit. He loves what he does and he looks forward to taking care of your dental and overall health.

Dr. Shivani Patel, DMD

Dr. Shivani Patel, DMD

Dr. Shivani Patel is originally from Methuen, MA and graduated valedictorian from Methuen High School. From high school she got accepted into an accelerated B.A./D.M.D. program at Tufts University. She received her bachelor of arts in Developmental Psychology and then her D.M.D. from Tufts School of Dental Medicine in 2008. At Tufts School of Dental Medicine she received the Quintessence Award for Excellence in Restorative Dentistry and was also an Academic Tutor and Clinical Teaching Assistant.

Dr. Patel has been an Assistant Professor at Tufts School of Dental Medicine since 2011. She loves teaching part time and being in private practice on the other days. Her practice focuses on all age groups (she especially loves working with children). Her goal is to make each patient comfortable through thorough diagnosis and treatment planning allowing her to provide comprehensive care to all her patients. She enjoys a wide range of cosmetic and restorative dentistry, root canal therapy, teeth whitening, implant restoration, veneers, teeth alignment (straightening), crowns and therapeutic Botox therapy. Dr. Patel is a member of the Massachusetts Dental Society and the American Dental Association. Dr. Patel attends continuing education courses including the Yankee Dental Congress in Boston to keep up-to-date with the latest advancements in dentistry.

Outside of the dental office, Dr. Patel enjoys traveling, teaching and learning Indian dance, and spending time with her family.

Dr. Stephen A. Cohen, DMD

Dr. Stephen A. Cohen, DMD

Dr. Stephen Cohen also earned his DMD degree from Tufts University School of Dental Medicine in 1992 where he graduated summa cum laude and is a member of the dental honors fraternity- Omicron Kappa Upsilon. Dr. Cohen then went on to do a residency at the Boston VA Hospital. Dr Cohen ran his own dental practice for 16 years in Toronto, Canada with cosmetic dentistry, implant dentistry ,endodontics (root canal therapy) and complex restorative dentistry as his main focus. He has maintained dental licensure in both USA and Canada and now works solely in the United States.

Dr. Cohen graduated from Upper Canada College in Toronto for high school, then went on to attend McGill University in Montreal where he obtained a Bachelor of Science degree with honors in anatomical sciences.

Dr. Cohen is also currently a member of the American Dental Association and the Massachusetts Dental Society, and has prior memberships in the Toronto Academy of Cosmetic Dentistry, Toronto Crown and Bridge Study Club, Ontario and Canadian Dental Associations, and the esteemed Spear Faculty Club in Scottsdale, Arizona.

Dr Cohen continues to spend countless hours in continuing education across the country while staying happily married to his wife Shari for 24 years. They have 2 university aged children , Melanie and Warren. Dr. Cohen also enjoys local deep sea fishing, and would love to be an avid golfer if he could play better.

Meet The Team


Jennifer

Jennifer

Director Of Operations

Jennifer joined the team in 2009 as a dental hygienist, after obtaining her bachelor’s degree from Forsyth School of Dental Hygiene at Massachusetts College of Pharmacy and Health Sciences. Since starting in 2009, Jennifer has transitioned into the business manager, and director of operations. She continues to further her education, and has become a Fellow of the American Association of Dental Office Management (FAADOM). Jennifer is also the founder and president of the Boston Chapter of AADOM, a non profit organization that brings local dental managers and practice administration together, for continuing education and networking events. Jennifer focuses on team training, networking, practice culture and furthering the education of the team. When she is not at the office, Jennifer enjoys spending time with her husband Dominick, and their two daughters Addison and Caroline. They loving taking trips to the lakes region of New Hampshire.



Kelly

Kelly

Office Manager

Kelly received her education in dental assisting from Quinsigamond Community College and joined our office in April of 2013. Since then, she has advanced her training becoming a certified dental assistant, a certified preventive functions dental assistant and an AADOM Fellow. Kelly is also a member of the Boston Chapter of AADOM. As office manager, she helps patients at the front desk, communicates with insurance companies, schedules appointments, handles billing procedures and supports the front desk with additional duties. Kelly loves spending time with her family at the beach, camping, gardening and hiking.



Dawn

Dawn

Dental Assistant

Dawn joined our team in 2006 after obtaining her certificate in dental assisting from Bryman Institute. She is CPR and radiology certified, and has advanced training in CEREC crown fabrication. Dawn assists our doctors in various dental procedures, while also helping our hygienists and our front office team. She is passionate about living a healthy lifestyle, and enjoys spending her time reading, gaming, and crocheting.



Heidi

Heidi

Administrative Assistant

As our administrative assistant, Heidi has been a part of our team since November of 2003. She obtained her Bachelor of Arts degree from Rutgers University in New Jersey and helps with front office duties, administrative tasks and patient assistance. Heidi hopes to continue to expand her knowledge and expertise within the realm of dental insurance and financial matters, so she is able to pass this information on to our patients. When she is away from the office, you can find her taking on various craft projects, including her favorite, painting furniture.



McKayla

McKayla

Registered Dental Hygienist

As a registered dental hygienist with our team, McKayla spends one-on-one time with her patients discussing oral health, and encouraging happy, healthy smiles. She attended Middlesex Community College, where she obtained her Associate of Science degree in dental hygiene, and has been with our team since April of 2018. McKayla is passionate about dental hygiene and loves motivating her patients to continually improve their oral health. She takes annual continuing education courses in order to keep up-to-date with the latest dental advances, and pass her knowledge on to her patients. She enjoys spending time with her family and friends, walking her dog, reading, traveling and learning more about real estate.



Patty

Patty

Registered Dental Hygienist

Patty is a registered dental hygienist, as has been practicing with our team since November of 2000. She received her Associate of Science degree in dental hygiene from Middlesex Community College, and holds her license to administer local anesthetic, while also being CPR certified. When she’s not at the office educating her patients about oral health, she is often gardening, making arts and crafts, or spending time with her friends and family.



Sandy

Sandy

Registered Dental Hygienist

Sandy joined our team as a registered dental hygienist in May of 2018, with an associate's degree from Middlesex Community College. She has advanced training in CPR and holds her certification to administer local anesthesia. She hopes to further her education through graduate studies and possibly teach, or enter into public health. When she is not seeing patients, Sandy loves spending time with her family and her 2 children, and taking additional courses through MCPHS University.