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 978-692-6012 and experience why our patients think Cornerstone Dental Group is the best dentist in Westford.

Meet The Doctor



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 ImplantologistsAmerican 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. 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 soley 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.


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 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 as 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.

Meet The Team


Jennifer – Director Of Operations

Jennifer has been a part of our team since 2009 after she obtained her bachelor’s degree from Forsyth School of Dental Hygiene at Massachusetts College of Pharmacy and Health Sciences. Upon joining us as a dental hygienist, Jennifer’s role has grown significantly. Through extensive training and continuing education courses, she now acts as our director of operations where she oversees our dental team and keeps them up-to-date on the ever-changing advances within the field. Since joining our team, Jennifer has taken on a true passion for dentistry, and continually strives to advance her education, and pass on her knowledge and charisma. She has become a Fellow of the American Association of Dental Office Management (FAADOM), a prestigious accomplishment obtained after meeting extensive requirements and training. She 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. In 2019, she was recognized for her on-going hard work and dedication, as she was nominated and honored by AADOM as a Practice Administrator of Distinction at their annual conference.

Through her extensive dental background, Jennifer focuses on team training, networking, practice culture, and furthering the education of the team. She strives to build a cohesive dental family that provides high-quality dental care to each and every individual, while focusing on patient education and the importance of a trusted, welcoming dental home. Every year, Jennifer joins her team as they attend the Yankee Dental Congress; New England’s largest meeting for dental professionals that are seeking the highest quality of continuing education. Each year, Jennifer takes multiple courses highlighting various areas of dentistry including patient care and dental office management. During her time away from the office, Jennifer enjoys spending time with her husband Dominick, and their two daughters Addison and Caroline. You can find them taking trips to the lakes region of New Hampshire, and spending time with their extended family and friends!


Heidi – Patient Coordinator

Heidi has been a part of our team since November of 2003, as a patient coordinator. Prior to her numerous years of experience in the dental field, she received her BA from Rutgers University in New Jersey. Heidi helps our team with front desk duties, and assists our patients during check-in and check-out. She communicates with insurance companies, assists with billing procedures, answers incoming calls, and helps our patients in scheduling appointments. During her free time, you can find Heidi traveling, painting, gardening and cooking.


Liz – Patient Coordinator

Liz joined our team in June of 2020, as a patient coordinator, after prior experience as a Professional Relations Director of an endodontic office. She graduated from Northwestern University with a BA in Asian Studies, and spent a year living in Shizuoka, Japan immersing herself in the culture and language. As a patient coordinator, Liz assists our patients at the front desk in scheduling appointments, accepting payments, answering patient questions, and supporting the team with additional tasks. In her free time, Liz is often spending time with her son, and their unique pets, which include aquatic snails, frogs and colorful dwarf shrimp. She also enjoys reading, playing video games and spending time at the beach.


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 the vice president of the Boston Chapter of AADOM. As an 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. She recently finished an amazing hike up Mount Washington!


Patty – Registered Dental Hygienistr

Patty is a registered dental hygienist, and 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.


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 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.

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.