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Meet Our Doctors

Meet Our Dentists in Brewster

Timothy C. McAdams, DDS


"Breakwater Dental is THE BEST! Dr. McAdams and his entire team are professional, courteous and caring in every way. Breakwater Dental is the best of the best."-Bob M.

Dr. McAdams loves the artistic component of dentistry, while at the same time helping people alleviate pain or increasing their self confidence with an improved smile. Practicing in the field of dentistry for the past 27 years has allowed him to really get to know his patients. It is a wonderful feeling for him to know that he's helped improve the lives of people he considers members of his family.


He attended Saint Anselm College in Manchester, NH before traveling across the pond to participate in an internship at Trinity College University of Dublin in Ireland. When he returned to the states, he completed his dental degree at Georgetown University’s School of Dental Medicine in Washington, DC. He continues his education through classes and seminars.

In The Office

At Breakwater Dental, it's all about the patients! Our staff keep the patients up to date on the latest information regarding how their oral health impacts their overall health. It is truly rewarding to experience the appreciation that we receive from our patients for the efforts we put into making their visit exceptional.

The team at Breakwater Dental is an extremely dedicated group of professionals. They continually strive to increase their own skills and knowledge relating to patient care and technology. The staff is committed to providing ultimate care and spends much of their time devoted to ensuring that each and every patient receives a truly exceptional experience.

Family Life

Dr. McAdams currently resides in Cotuit with his wife, Maureen, and their four sons Dan, Jack, Bryan, and Charlie. They love to spend quality time as a family, especially sailing, boating and cheering for our favorite sports teams, the Red Sox, Celtics, and Patriots!

David T. Quinton, DDS

 "Breakwater Dental is the most caring, thoroughly professional, clean and germ conscious dentistry I have ever been in. Dr. Quinton was kind, professional and explained all. Couldn't have has a better experience." – Christine B.

Dr. Quinton grew up in Southern New Jersey and attended undergraduate school at the University of Pennsylvania.  He earned his dental degree from the New York University College of Dentistry where he was asked to join the prestigious Special Patient Care Honors Program due to his warm bedside manner and attention to detail. After dental school, Dr. Quinton completed a general dental residency at Jamaica Hospital Medical Center, a level-one trauma center in New York.

He is Invisalign (clear braces) certified, has training in CEREC (same day tooth restorations), pediatric dentistry, rotary endodontics, and sleep apnea and snoring treatments.

Dr. Quinton lives in Brewster with his wife, Yolanta, and their two young children, Sophia and Joshua. When he is not in the office, he loves spending time with his family, and taking long walks on the beach with their yellow lab, Daisy. Dr. Quinton is also an active member of the Brewster Men's Club, The Cape Cod Young Professionals and Nauset Newcomers

Alexandra L. Armstrong, DMD

Dr. Armstrong was born and raised in central New Jersey. Growing up she was interested in science and knew from an early age she wanted to become a doctor. Her thoughts were confirmed one high school summer when she interned at Lehigh Valley Hospital’s Dental Department. She received her Bachelor of Science in Biology from Lafayette College and her dental degree at Case Western Reserve University School of Dental Medicine in Cleveland, Ohio. Dr. Armstrong completed her advanced education in General Dentistry Residency at the Olin E. Teague Veteran’s Medical Center in Temple, Texas.

Dr. Armstrong served as an Associate Dentist at Temple Dental Arts in Temple, Texas and most recently as a Staff Dentist at the Community Health Center of Cape Cod where she also mentored dental students. She is devoted to restoring and enhancing patient’s smiles through compassionate, skilled dental care and has experienced training in general, cosmetic and restorative dentistry. 

During her time in Texas she met her husband, Jeremy, a native Cape Codder who was an Army soldier and Operation Iraqi Freedom veteran stationed at Fort Hood.  They moved back to Cape Cod so they could be closer to their families and friends.  She and her husband enjoy spending time outdoors with their dogs Wrigley, a puggle, and Nauset, a rescued retriever-mix.  They also like competing in marathons for numerous charitable organizations, listening to country music, and cheering on our Boston sports teams.