Dr. Mark and his talented and caring clinical and administrative staff make sure you and your child have the best possible dental experience at every visit. The hygienists and dental assistants provide much of the dental care and dental education in the pediatric dental office. They have a wealth of knowledge and are here to answer your questions about diet, oral hygiene, oral habits and more.

Dr. Mark R. Harrison, D.D.S.

• Graduate of Temple University School of Dentistry
• Residency in Oral Pediatrics
• Former Faculty of Temple University School of Dental Medicine, Department of Pediatric Dentistry
• Former Faculty of University of Pennsylvania School of Dental Medicine, Department of Pediatric Dentistry
• University of West Virginia School of Dentistry — Former Faculty, Department of Pediatric Dentistry
• Participant with Special Smiles Program through Special Olympics™
• Frequent Missions Abroad to Provide Dentistry for Underserved Children
• Member of:  AAPD, NHAPD, Diplomate American Board of Pediatric Dentistry
• Department of Surgery at Exeter Hospital

Dr. Harrison uses any spare time to enjoy his family and old cars.

Rebecca Dunton, RDH, CDA

We would like to welcome and introduce Rebecca our new hygienist. She comes to us with 10 years of experience in the pediatric dental field. Rebecca started as an assistant and loved it so much that she continued her education and became a dental hygienist. So far, she has helped to make our patients have a fun and happy dental experience.

Rebecca enjoys the outdoors and hiking with her dog Mason. She is excited to meet all of our awesome patients and make their smiles sparkle!


Robin Gagnon, DA

Robin is one of Dr. Harrison’s dental assistants. She has been working for Dr. Harrison since January 2003 and has certifications in radiology, coronal polishing, dental sealants, and expanded orthodontic duties.

She also assists Dr. Harrison with dental procedures performed at Exeter Hospital. Robin has attended the Dental Career Institute and NHTI in Concord.

Her main goal as a dental assistant is to help her patients have a fun and happy experience in a dental atmosphere. She enjoys wood burning, painting, sketching, and spending time with her family.

Marlene LaRhette, Account Services Representative

Marlene is married with four children and seven grandchildren. She enjoys spending time with her family on Sebago Lake boating, swimming, and walking. Marlene is a Pease Greeter, showing her support for our troops leaving or returning from deployment. She is also a member of the Elks.

Prior to moving here from Massachusetts, Marlene worked in real estate and sales-related positions. Marlene has been in the dental office environment for several years since moving to the Seacoast Region. She joined Dr. Harrison’s staff in late 2011, and comes with front desk skills from a similar position.

Marlene helps with accounting and managing the oral rehabilitation schedule at Exeter Hospital for Dr. Harrison.

Kimberly Russell, RDH, CDA

Kimberly is a graduate of the University of New England and Northern Essex Community College. She has been in the field of dentistry for 10 years, first as a Certified Dental Assistant and now as a Dental Hygienist. Kimberly loves working with kids to establish good dental habits and experiences early for a lifetime of good oral and over all health.

In her spare time Kimberly enjoys reading and spending time with her husband and their rabbit Buttercup.