We are a group of doctors and staff who are committed to providing you and your child with a positive, comfortable and safe dental health experience. We care deeply about our patients and we treat them like family.

Founded in 1974, PDA Dental Group has served thousands of patients in the greater Boston area. Some of our doctors have been with the practice since the beginning, and have had the pleasure of seeing past pediatric patients return with their own children and as patients! We are proud of the positive, trusting relationships we have built with our patients as we strive to serve all family members from infancy through adulthood.

Winchester Foundation -Trivia Bee Connect the Tots of Reading Town Day of Winchester&Reading Fall Street Town Faire Preschool Visits (Dental Education) Burbank YMCA Family Action Network of Winchester Reading Educational Foundation The Professional Center for Child Development Room to Grow

We offer comprehensive pediatric, orthodontic, general, restorative and cosmetic dentistry services. With dental offices in Reading and Winchester, Massachusetts, we serve families from towns throughout the Boston area, including Wakefield, Melrose, Stoneham, Medford, Lynnfield, North Reading, Andover, Arlington, Lexington, Bedford, Burlington, Woburn, Wilmington, Peabody, Danvers, Saugus and more.

In November 1974, while serving as an Associate Clinical Professor of Pediatric Dentistry and Dentist-in-Chief of the Tufts Dental Facilities for Persons with Special Needs, Dr. Joseph P. ODonnell started a part-time practice of pediatric dentistry in Winchester. The office was very smalljust two dental chairsand was only open two weekday afternoons and Saturdays. Dr. ODonnell had one employeea dental assistant who also served as a secretary. In early 1975, he hired his first hygienist, Bea Wheaton, who remains as a principal member of the PDA staff.

As the practice became busier, Dr. ODonnell added a partner, Dr. Gary Warrington who had been an outstanding student in Dr. ODonnells post-graduate residency program at the Tufts-New England Medical Center. At this time the practice officially became Pediatric Dental Associates of Winchester (PDA).

Over the subsequent years, the practice added several highly qualified pediatric dentists to the staff: Dr. Geraldine Garcia-Rogers, Dr. Sonia Wu and Dr. Nicole Harringtonall of whom are partners. We are also proud to say that all of our pediatric dentists are Board Certified.

In 1998 PDA expanded and opened a second location in Reading, MA where our services include pediatric dentistry, orthodontics and adult dentistry. Dr. Shannon Duffy is also a partner and directs the orthodontic department, while Dr. Kimberly Weiss provides adult dental services.

Our practice is now PDAthe Group Dental Practice of Winchester and Reading. We are proud to say that we have more than fifty employeespart-time and full-timemany of whom have worked with us for more than twenty years. We are grateful to our patients for the tremendous support and confidence that has combined to help our practice grow. We pledge to reward your confidence by continuing to offer dental services of the highest quality in a safe, friendly and state-of-the art environment.

Dr. Sonia J. Wu is a graduate of Cornell University where she received her Bachelor of Science degree. She received her dental degree from the University of Pennsylvania School of Dental Medicine. Following her graduation from dental school, Dr. Wu completed a two-year residency program in pediatric dentistry at the Lutheran Medical Center in Brooklyn, New York. While in New York, Dr. Wu also served as a Clinical Instructor in Pediatric Dentistry at New York University.

Dr. Wu has been active in community service projects, having provided dental education and screening for children of underserved communities and Headstart, and has worked with the Special Smiles program of the Special Olympics. Dr. Wu has also made a research presentation to the Annual Meeting of the American Academy of Pediatric Dentistry, is a board certified Diplomate of the American Board of Pediatric Dentistry and a member of that organization. She is also a member of the American Dental Association.

Dr. Nicole is a graduate of Stonehill College where she earned her Bachelor of Science degree with a major in Biology and was captain of the varsity womens lacrosse team. Dr. Nicole received her dental degree from Tufts University School of Dental Medicine. While at Tufts, she earned Tufts Merit Scholarships for outstanding academic performance and received the senior award for Clinical Excellence in Pediatric Dentistry. Upon graduation from dental school, her academic honors included magna cum laude and induction into Omicron Kappa Upsilon, the National Dental Honor Society. Dr. Nicole completed her residency in pediatric dentistry at the University of Connecticut School Of Dental Medicine.

Dr. Nicole is a board certified Diplomate of the American Board of Pediatric Dentistry, a member of the American Academy of Pediatric Dentistry, American Dental Association, and Massachusetts Dental Society. In 2014, Dr. Nicole served as the Chair to the Middlesex District and was awarded the 10 Under ten award by the Massachusetts Dental Society to honor her significant contributions to the dental profession, the community, and organized dentistry.

Dr. Nicole currently resides in North Reading with her husband Josh, sons Tyler, Drew and Chase, along with their dog Brinley. She enjoys the opportunity to provide dental care to children of the community where she grew up and the town where she currently lives.

Dr. Matthew D. Freitas was raised in Chelmsford, MA. While in high school, he won state championship in both diving and pole vaulting. He is a graduate of Brown University where he received his Bachelor of Science degree in neuroscience and competed on the varsity swimming and diving team. At Brown he was awarded a teaching and research assistantship scholarship in neuroscience and earned the scholar athlete award. Dr. Matt received his dental degree from Tufts University. While at Tufts, he focused his training in pediatric dentistry and specialized training in the treatment of cleft lip and palate.

Dr. Matt obtained his post-graduate specialty training in pediatric dentistry as chief resident at the Lutheran Pediatric Dentistry Specialty Program in Providence, RI. He also completed specialized training in presurgical treatment of cleft lip and palate at New York University. During his residency he was on the cleft team at Hasbro Hospital in Rhode Island, providing presurgical nasoalveolar molding (NAM) for infants with clefts.

In 2020, Dr. Matt was recognized among the '10 Under Ten' by the Massachusetts Dental Society. This recognition is given to 10 dentists every year who have graduated from dental school within the past 10 years, are a Massachusetts Dental Society member, and have made significant contributions to their profession, their community, and organized dentistry.

Dr. Matt is a Board Certified Diplomate of the American Board of Pediatric Dentistry. He is a member of the American Dental Association, the American Academy of Pediatric Dentistry and the Massachusetts Dental Society.

Currently, Dr. Matt resides in Chelmsford, MA with his partner, their three children Miles, Ava and Finn, and their two goldendoodle dogs. He is an avid long-distance runner and has completed several marathons. He enjoys spending time with his family, running and travel.

Dr. Karina is originally from Colombia. She attended the University of Florida and received a Bachelor of Science in Nutritional Sciences. Upon completing her undergraduate studies, she continued on to receive her dental degree from Boston University Henry M. Goldman School of Dental Medicine, where she received multiple distinctions including induction into the National Dental Honor Society, Omicron Kappa Upsilon. Dr. Karina completed her pediatric dentistry residency at the University of Connecticut and Connecticut Childrens Medical Center.

While earning her dental degree, Dr. Karina volunteered and provided dental screenings at various organizations in the Boston area, such as Special Olympics Special Smiles Program, Countdown to Kindergarten and Middle O at Fenway Park.

She is a Board Certified Diplomate of the American Board of Pediatric Dentistry, a Fellow at the Royal College of Dentists of Canada, a member of the American Academy of Pediatric Dentistry and American Dental Association.

Dr. Karina understands the importance of creating a comfortable environment for treating her patients as she would treat her own familywith compassion, patience, and respect. When not in the office, she enjoys spending time with family and friends, and likes staying active by attending spinning classes, yoga, running, hiking and camping. She currently lives in Somerville with her husband.

Dr. Kristen attended Bowdoin College and graduated Magna Cum Laude receiving a Bachelor of Arts degree with a concentration in Neuroscience. She continued her education at Harvard School of Dental Medicine to earn her dental degree, Magna Cum Laude, and induction into the Omicron Kappa Upsilon Honor Dental Society. After finishing her dental degree, Dr. Kristen completed her pediatric dentistry residency at Cohen Childrens Medical Center in New Hyde Park, NY where she was Chief Resident.

While completing her education, Dr. Kristen participated in an externship and a pediatric rotation at Boston Childrens Hospital, volunteered at ACTION (Action for Children and Teens in Oral Health Need), Give Kids a Smile Day and Yawkey Boys & Girls Club, and provided dental treatment at Harvard Dental Center Teaching Practice. Holding various leadership roles through the years, Dr. Kristen also dedicated her time to numerous research projects in the neuroscience field and tutored students in comparative physiology. Her hard work and dedication earned her various honors such as the Harvard Dental Alumni Association Silver Medal and HMS Scholars in Medicine Community Service Project Award.

Dr. Kristen is originally from Maine and very excited to be moving back to the Boston area. She enjoys yoga, meditation and spending time with family and friends. She is an avid skier and outdoor enthusiast!

Dr. Juliana Garfinkle received her Bachelor of Science degree from Vanderbilt University, majoring in Child Development followed by the completion of the Pre-Health Post-Baccalaureate Program at Harvard University Extension School. She then received her dental degree from Columbia University College of Dental Medicine.

While at dental school, Dr. Juliana was an active member of the community serving as Class Philanthropy Chair, the AAPD Club's Events Coordinator and a member of the Alpha Omega Dental Fraternity. She was awarded the Columbia University College of Dental Medicine Summer Research Fellowship where she examined the role of candies on dental decay in children. Before graduating, Dr. Juliana received the NYAD Student Research Award and ADA/Dentsply Student Clinician Research Award.

Dr. Juliana completed her post-graduate pediatric training at Cohen Children's Hospital at Northwell Health/LIJ in New York earning a Certificate in Pediatric Dentistry and she served as Chief Resident. This position gave her the opportunity to work closely with the Program Director in forming resident schedules, coordinating program changes, acting as the liaison between residents and staff and overall enhancing communication within the program.

When Dr. Juliana is not in the office, she is spending time with her husband, daughter and rescue dog. She is passionate about working with and understanding children and is very excited to bring her experience in pediatric dentistry to PDA Dental Group.

Dr. Hayley Golden received her Bachelor of Arts degree in Biology from Wheaton College and then continued her studies at Baruch College where she completed her Post-Baccalaureate coursework. While attending Wheaton College, she earned Deans Honor List, was a Trustee Scholar, a member of the Beta Beta Beta Biological Honor Society and received the Julia R. Lange Fellowship.

She completed her dental degree at Columbia University College of Dental Medicine where she was a member of the AADMD Club, AAPD Club and the Zsi Xsi Phi Dental Fraternity. During dental school, Dr. Hayley participated in pediatric and clinical externships at Helen Hayes Rehabilitation Hospital, Columbia Pediatric Dentistry Program and Kings County Hospital GPR Program.

Dr. Hayley went on to complete her two-year speciality training at Stony Brook School of Dental Medicine where she received her Certificate in Pediatric Dentistry. While in the program, Dr. Hayley served as Co-Chief Resident.

Over the years, Dr. Hayley has volunteered her time to various organizations such as Reach out and Read at NYU Pediatric Dental Clinic, Operation Exodus OHI Event, and Give Kids a Smile, a community based oral health care service.

In her free time, Dr. Hayley enjoys walking her dog and watching The Office with her husband. She also likes to spend her time knitting and doing embroidery. She and her husband just moved to Brookline from New York City and are looking forward to exploring the area!

A graduate of the University of Maine, Dr. Gary Warrington completed his dental school education at Tufts University School of Dental Medicine where he graduated magna cum laude. He also received awards for clinical achievement in both Pediatric Dentistry and Endodontics and was inducted into Omicron Kappa Upsilon, the National Dental Honor Society.

Dr. Joseph P. O'Donnell is a graduate of the University of Pittsburgh and the University of Pittsburgh School of Dental Medicine. Following his graduation from dental school, Dr. O'Donnell completed his specialty training in pediatric dentistry at the TuftsNew England Medical Center and Tufts University where he received his Master's Degree and was inducted into Omicron Kappa Upsilon, the National Dental Honor Society, and Sigma Xi, the honorary research society.

Dr. O'Donnell is a Diplomate of the American Board of Pediatric Dentistry, a Fellow of the International College of Dentists, and a Fellow of the American Academy of Pediatric Dentistry. He is also a past president of the College of Diplomates of the American Board of Pediatric Dentistry. In addition to his practice in Winchester and Reading, Dr. O'Donnell has served as Chief of Pediatric Dentistry at the TuftsNew England Medical Center and Dentist in Chief of the Tufts Dental Facilities for persons with special needs. Dr. O'Donnell is also an Associate Clinical Professor of Pediatric Dentistry at Tufts University School of Dental Medicine.

Dr. O'Donnell's outside interests include creative writing. He is the author of three mystery novels, the main character of which is the basis for a screenplay that is being made into a feature motion picture. He and his wife, Ronney, are also the proud parents of two grown children and twowonderful granddaughters.

Dr. Shannon L. Duffy is a graduate of Brandeis University where she majored in Biology and was a member of the varsity women's basketball team. She received her Doctor of Dental Medicine degree from the University of Connecticut and was inducted into Omicron Kappa Upsilon, the National Dental Honor Society. Dr. Duffy completed her three year post-graduate training in orthodontics at Stony Brook University in New York.

Dr. Duffy conducted research at Stony Brook and the Beth Israel Deaconess Medical Center and her work was published in scientific journals. She is a member of the American Dental Association, the American Association of Orthodontists, and the Massachusetts Dental Society.

Dr. Kieran Mullarney received his Bachelor of Science degree in Chemistry, Magna Cum Laude, from The College of New Jersey. He then continued on to Temple University Kornberg School of Dentistry to earn his Doctor of Dental Medicine degree. At Temple University, Dr. Mullarney graduated fifth in his class and earned Deans List and the Deans Scholar Award. His academic excellence earned him induction into the Temple Orthodontic Honors Program and the Omicron Kappa Upsilon Dental Honor Society. Dr. Mullarney completed his post-graduate orthodontic training at Tufts University School of Dental Medicine earning a Certificate in Orthodontics and Dentofacial Orthopedics. Over the years, Dr. Mullarney has been involved in many organizations. While attending Temple University, he was a member of the Temple Humanistic Culture and Diversity Committee, member and chair of American Student Dental Association Wellness Committee, and a member of Temple Haiti Club. Most recently at Tufts University he was the Resident Liaison for the Tufts University Ethics and Professionalism Committee. Dr. Mullarney grew up in New Jersey and currently resides in Cambridge, MA. He enjoys outdoor activities including running and hiking, exploring new places, immersing himself in new cultures, and spending time with friends, family, and his awesome cat Jupiter.

Dr. Mariko Kato is a graduate of the University of Michigan where she majored in history and subsequently received her dental degree from Columbia University. She received multiple letters of commendation for academic excellence and was inducted into the Omicron Kappa Upsilon National Dental Honor Society. Following dental school, Dr. Kato completed her post-doctorate orthodontic training at New York University. Originally from Kobe, Japan, Dr. Kato has moved between the U.S. and Japan several times during her formative years and feels blessed to know the best of both worlds. In her spare time, she enjoys traveling and spending quality time with her family and friends and snuggling with the familys Whoodle, Kuma.

A graduate of Brandeis University where she graduated Cum Laude, Dr. Kimberly Weiss pursued her dental education at The Ohio State University College of Dentistry where, once again, she graduated Cum Laude. While at Ohio State she served as Team Dentist for varsity athletes and received the Demkee Dental Athletic Provider Award.

Following dental school, she entered the two-year post-graduate Harvard Wide General Practice Residency Program. Dr. Weiss was named Chief Resident during her second year and received the Biotene Award for excellence in Hospital Dentistry in recognition of meritorious achievement, scholarship and contributions to the practice of hospital dentistry.

Dr. Weiss has had more than eighteen years of experience in general dentistry while engaging in a private dental practice and later with the Massachusetts General Hospital Dental Group. She has also been an instructor and advisor to dental students at the Harvard School of Dental Medicine. Dr. Weiss areas of expertise include all aspects of general restorative and prosthetic dentistry, crowns, bridges and the restoration of dental implants. She is a member of the American Dental Association and the Massachusetts Dental Society. Her personal hobbies include reading, hiking, skiing and spending time with her husband and three children.

Dr. Melissa J. Torres received her Bachelor of Science degree in Biology, Cum Laude, from Salem State University. She continued her studies at Howard University College of Dentistry where she received her Doctor of Dental Surgery degree, placing 2nd in her class. Her academic achievement earned her induction into the Omicron Kappa Upsilon National Dental Honor Society. She received The Dr. H. Norton Duhaney Award in Fixed Prosthodontics and the Department of Restorative Dentistry Award, along with being recognized for Outstanding Undergraduate Achievement in the Study of Prosthodontics.

While attending school, Dr. Torres expanded her skills and experience by working with an oral and maxillofacial surgeon, completing internships through various programs such as Tufts University School of Dental Medicine and volunteering at numerous dental clinics and healthcare fairs.

She completed her post graduate residency through the Advanced Education in General Dentistry Program at Tufts University School of Dental Medicine. She is a member of the American Dental Association and the Massachusetts Dental Society.

December 5, 2019 Kicking off the holiday season with another fun, festive Shop the Block in downtown Reading! PDA Dental Group loved socializing with the community and offered raffles, hot chocolate bar and shopping specials.

November 14, 2019 Lori, one of our registered hygienists, visited the students at Knowledge Beginnings in North Reading with Canine the dog and Hippo Helper to educate about oral health and good dental habits.

August 21, 2019 It is time for a check-up! PDA Dental Group was a proud sponsor of North Readings Parks and Recreation Teddy Bear Picnic, where children could bring their teddy bears for a healthy check up and other fun children activities!

June 2, 2019 PDA Dental Group was honored to sponsor and attend the North Reading Town Day! Perfect day for the community at Ipswich River Park featuring many local businesses, fun family activities and delicious food.

May 16, 2019 Lori, one of our registered dental hygienists, and Canine the pup visited Andover School of Montessori to educate the students on good oral health habits and play some fun dental themed games!

April 12, 2019 Thank you to Winchesters Lynch Elementary School for having attend your Health Fair. Vanessa, one of our dental hygienists loved meeting all your students and sharing her dental knowledge.

March 23, 2019 As a sponsor for the event, PDA Dental Group loved being part of this spring-time, musical event! Lina, Lori and Kara handed out fun goodies and dental supplies to families who attended the concert.

February 18, 2019 PDA Dental Group was a proud sponsor for the Winchester Foundation for Educational Excellence Trivia bee. Dr. Gary, Dr. Sean and Lina enjoyed participating in the trivia competition.

October 27, 2018 A great way to kick off Halloween! As a sponsor for FAN of Winchesters Halloween Horribles party, Dr. Wu, Linda and Kara had a fun morning seeing many patients and meeting new families all dressed up for Halloween.

November 14, 2017 PDA Dental Group held a ribbon cutting ceremony to celebrate the opening of our new Reading location at 54 Haven Street! Thank you to the Reading Chamber of Commerce and its Board Members for attending the ceremony!

August 23, 2017 Dr. Nicole and Annie had a great time at the North Reading Recreation Departments Teddy Bear Picnic, where children enjoyed learning about from experts in the medical and dental fields, face painting, crafts and more!