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Dedicated Dental Care Focused on Your Overall Health

Meet Our Ashland Dentists

Serving the Greater MetroWest Area & Middlesex County

Dr John Zarrella has been a family dentist since 1987 along with his colleagues Dr Peter Rider, Endodontist, specializing in root canal therapy, and Dr Paola Buckley, Periodontist. Our professional dental team can help every member of your family living in the metro west area and beyond to have healthy teeth and gums. We invite you to experience our expertise.

Dr. John Zarrella, DMD

Dr. John Zarrella, DMDDr. John Zarrella has been practicing in the field of dentistry since 1987. He completed his dental education from Boston University School of Graduate Dentistry; receiving special awards for periodontal care, radiology and restorative patient care, after receiving a Bachelor of Science degree from Clark University.

Dr. Zarrella participates in public lectures and volunteers with the Massachusetts Dental Society’s “Give Kids a Smile” program which provides affordable quality dental healthcare services to children. He has published articles locally on oral health and wellness and provides the community with complimentary oral cancer screenings to several groups including the VFW, Senior Citizen Centers, and Metro West Hospital in addition to private companies.

Over the years, Dr. Zarrella has been heavily involved in other charity events, including the Metro West Free Dental Program, the Sudbury Free Health program, and Fall for Smiles. These programs help the less fortunate members of our community get access to dental care. He actively donates to local cancer fundraiser events including Relay for Life, Pan Mass Challenge, The Lupus Foundation, and the Visiting Nurses Association.

The Specialty training Dr. Zarrella received at the world-renowned advanced education center at the Pankey Institute has allowed him to help hundreds of women and men with migraines and stress headaches. To learn more, you can visit and

Dr. Zarrella is a member of the American Dental Association, Massachusetts Dental Society, Metro West Study Club, MDI Study club, Periodontal Study Club, the Pankey Institute for Advanced Study, and the Spear study group and advance training

Dr. Rider, DMD

Dr. Rider, DMDPeter C. Rider, DMD, specializes in endodontics (root canal therapy), has practiced in the Metro West area for 20 years, and enjoys working in a group practice setting. He strives “to educate patients in various phases of dentistry as well as treat them endodontically.”

Born and raised in Yeadon, PA, Dr. Rider received a B.S. degree from Providence College in 1967. He then attended Tufts University School of Dental Medicine, graduating in 1971.

After serving in the United States Air Force, Dr. Rider attended the State University of New York at Buffalo, where he received his certificate in endodontics in 1977. Dr. Rider is a member of the American Association of Endodontics, American Dental Society, and the Massachusetts Dental Society.

He and his family have lived in Holliston for 15 years. Dr. Rider’s personal interests include tennis, cycling, and gourmet cooking.


  • 1963 – 1967 Providence College, Bachelor of Science
  • 1967 – 1971 Tufts University School of Dentistry, D.M.D
  • 1975 – 1977 University of Buffalo Dental School, Degree in Specialty of Endodontics

Dr. Buckley, DMD, CAGS, DSC.

Dr. Buckley, DMD, CAGS, DSC.Dr. Paola Buckley received her DDS from El Bosque University in Bogotá, Colombia in 2000. She practiced as a general dentist in her native Bogotá while serving as a Teaching Associate and Researcher in Periodontal Microbiology for her school’s department of Oral Microbiology. Her love for periodontal research brought her to the United States to pursue a research opportunity at the prestigious Forsyth Institute in Boston, MA. Later, she earned her Doctor of Science Degree in Oral Biology at the Boston University, Henry M. Goldman School of Dental Medicine in 2008.

During her postdoctoral years, she published several articles about periodontal disease biology. But it was her love for patient care and education which motivated her to incorporate her knowledge of the periodontology basic sciences into a fulfilling clinical practice. She dedicated herself into pursuing additional training and completed a two-year specialty program in Clinical Periodontology and Implantology at the Henry M. Goldman School of Dental Medicine and a DMD program designed for international trained dentists at the same University.

Currently, Dr. Buckley is a Clinical Assistant Professor for the Predoctoral Periodontology Department at Boston University Henry M Goldman School of Dental Medicine, where she supervises and instructs students in all aspects of periodontal disease and treatment. Dr. Buckley is very passionate about periodontology and dental implantology and is always current on the latest techniques and treatment services.

She attends multiple professional meetings throughout the year and is an active member of the American Academy of Periodontology, American Dental Association, Massachusetts Dental Society and the Hispanic Dental Association. She is committed to providing preventive services and excellent dental care to all patients.

During her free time, Dr. Buckley enjoys spending time with her husband Joe, their son Matthew (Mateo) and their pets (Mitsy, Shea and Madie) in their home in Natick and their beach house in Wells, Maine.

For more information about our dentists, or to schedule your next appointment and become part of our dental family, call Zarrella Dentistry at (508) 244-4167.

A Unique Dental Experience

  • He & the crew are incredible. My whole family goes there now.

    “We would not go anywhere else. I hope he never retires.”


  • An office full of fun, happy, friendly people and a Dr. who calls after hours to check up on his patients’ well-being.

    “I have been very pleased with the outcome and the time it took to reach it.”


  • The first step on my road to a healthy mouth!

    “A truly supportive team! ...Thank you to everyone on Team Zarrella!! See you soon!”


  • An all-around great experience. As soon as Caleigh answers the phone you will see what a friendly, warm, and welcoming experience you will have.

    “Dr. Z is extremely knowledgable and welcoming. He not only tells you what you need, but why you need it.”


  • I've been going to Dr. Zarrella for longer than I can remember

    “At this rate I'll never leave Dr. Zarrella, that'd just be weird!!”

    Sasha G.