Experienced clinicians who care.

Doctor of Dental Medicine

Dr. Diana Li

Dr. Diana Li is a dedicated and compassionate dentist committed to providing high-quality, patient-centered care. She earned her Bachelor of Science in Business Management from Boston College before pursuing her Doctor of Dental Medicine degree at Tufts University School of Dental Medicine.

Growing up in the heart of Boston's Chinatown, Dr. Li developed a deep appreciation for community, diversity, and the importance of building meaningful relationships through healthcare — values that continue to shape her approach to dentistry today.

Following dental school, Dr. Li proudly served as an Army dentist at Fort Hood, Texas, where she provided comprehensive dental care to active-duty soldiers for three years. Her time in the military strengthened her clinical skills, adaptability, and commitment to serving diverse patient populations.

After returning to Massachusetts, Dr. Li continued her service in the Army National Guard for five years, achieving the rank of Major. During this time, she participated in a humanitarian mission in Kenya, providing dental care alongside U.S. and Kenyan healthcare teams. The experience further deepened her dedication to compassionate care and service beyond the office.

View photos from the Kenya Mission →

Dr. Li believes in a patient-first approach, taking the time to educate and empower each patient to make confident, informed decisions about their oral health. She remains committed to continuing education and staying current with advancements in dentistry to provide modern, effective treatment options for her patients.

She is a member of professional organizations including the American Dental Association and the Massachusetts Dental Society.

Outside of the office, Dr. Li enjoys staying active, traveling, and creating meaningful memories with her two sons.

Doctor of Dental Medicine

Dr. Robert Guen

Dr. Robert Guen is a highly respected and experienced dentist with a longstanding commitment to clinical excellence and compassionate patient care. He earned his Doctor of Dental Medicine degree from Tufts University School of Dental Medicine and completed a General Practice Residency at New England Medical Center. He held a faculty appointment at Tufts Dental School and enjoyed full bed and surgical privileges at the hospital.

Since 1978, he established a private practice, where he was known for his steady, thoughtful approach and dedication to delivering reliable, high-quality dental care. His depth of knowledge and clinical expertise have earned him the trust of generations of patients. Dr. Guen believes in providing personalized care focused on long-term oral health, patient comfort, and lasting results. His approach emphasizes trust, consistency, and excellence in every aspect of care.

Additionally, he has contributed to the broader community through his service as Treasurer of the Boston City Hospital, the Boston School Committee, and as Co-Founder of the Academy of the Pacific Rim Public Charter School.

Dr. Guen serves on the board of the North American Chinese Invitational Volleyball Tournament, has coached and led youth at the Wang Chinatown YMCA, and is active in preserving the archival history of Boston's Chinatown.