Dentist Framingham | Orris Dental | About Us
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Ali Maddahi, MS, DMD

General Dentist

Dr. Maddahi has over 33 years of clinical experience coupled with more than 25 years of teaching and research experience in dentistry. Since founding Orris Dental in 2010, he concurrently serves as an Attending Dentist at the Cambridge Health Alliance Dental Clinic’s General Dentistry Residency program. Dr. Maddahi also holds a lecturer position at the Harvard School of Dental Medicine, Department of Oral Health Policy and Epidemiology.

A firm believer in staying current with evolving practices, Dr. Maddahi actively pursues continuing education and completes multiple courses annually. Dr. Maddahi has completed a diverse range of courses, including gum treatments, oral surgeries, dental implants, dental crowns, root canal therapy, limited orthodontics, removable dentures, cosmetic ceramic and veneer restorations, and the innovative HealthyStart Habit correctors—an eruption-guided therapy designed for children to reduce the likelihood of future orthodontic needs.

Dr. Maddahi has also completed a mini-residency program in Dental Sleep Medicine at Tufts University’s School of Dental Medicine to treat Obstructive Sleep Apnea with oral devices.

Tufts University School of Dental Medicine (Doctor of Dental Medicine)
Harvard Medical School (Postdoctoral Research Fellowship in Medicine)

Professional Associations
American Dental Association
American Academy of Sleep Medicine
American Academy of Dental Sleep Medicine
Massachusetts Dental Society

Caleb Tam, MS, DDS

General Dentist

Dr. Caleb Tam was born and raised in the Bay Area, California. He earned his BS in biology (2009) from the University of California, Davis, and his MS in biomedical engineering (2013) and DDS (2018) from the University of California, San Francisco (UCSF). During his time at UCSF, he received 4 Clinical and Research Excellence Day awards and has been presented with scholarships from the American Dental Association (ADA) Foundation, International/American Association for Dental Research (IADR/AADR), Colgate, Pierre Fauchard Academy, Academy of Osseointegration, and Academy of Dental Materials.

After graduating from dental school, Dr. Tam completed a General Practice Residency through Harvard School of Dental Medicine/Cambridge Health Alliance (2019), where he has since remained on board and currently serves as Chief of Dental Services. His primary academic/research interests include dental biomaterials, dental regenerative therapies, and the “Oral Physician” training model.

Dr. Tam also has a passion for outreach and education as he enjoys volunteering in his local community as well as serving as a mentor for future generations of dental professionals. He is currently involved with efforts such as the Healthy Smiles Project (Cambridge Health Alliance), African Community Health Initiatives (Boston), and Biomedical Careers Science Program (Harvard Medical School).