Our Doctors

Merrimack Dental Dentist

Dr. Audrey Herod, DMD

Dr. Herod is a native of New Hampshire having grown up in the neighboring city of Manchester. She graduated Magna Cum Laude from Saint Anselm College in 2001 with a Bachelor of Arts degree in Biology.

She received her Doctor of Dental Medicine degree from the University of Connecticut in 2005. While at UCONN she received several honors including the Academy of Operative Dentistry Award, the American Academy of Oral Medicine Award, the University of Connecticut School of Dental Medicine Community Service Award, and the Kohrman Award for excellence in complete denture prosthesis.

After completing her four year dental degree she spent one year in a GPR (general practice residency) at the VA Medical Center in Manchester, NH performing comprehensive dental care for our veterans.


Currently Dr. Herod is a member of the American Dental Association and New Hampshire Dental Society. She has been named in NH magazine as a Top Dentist in the field of General Dentistry. She truly enjoys treating both adult and child patients and is very happy to be helping maintain the dental health of individuals in her community.  Dr. Herod is married and lives locally with her husband and two daughters.

Merrimack Dental Dentist

Dr. Erika Antonsson, DMD

Dr. Antonsson earned her DMD degree from Boston University School of Dental Medicine where she graduated with Magna Cum Laude honors. Dr. Antonsson grew up in northern Massachusetts and attended the University of Massachusetts at Amherst where she received a BS in pre-veterinary medicine prior to attending dental school. She is dedicated to education and lifelong learning through continuing education programs to provide the most up to date dental care to her patients.


She is passionate about providing her patients with care that is comprehensive, courteous, and responsive to their individual needs. She is committed to volunteering and has traveled to Nicaragua and Costa Rica to provide dental care to those in need. She enjoys seeing patients of all ages and is certified in ClearCorrect orthodontics. Dr. Antonsson is currently licensed in both New Hampshire and Massachusetts.


Dr. Antonsson resides in the North Shore of Massachusetts with her fiancé and their dog and cat. In her free time she enjoys spending time with family and friends, gardening, cooking, and exploring the outdoors. She loves the ocean, and enjoys taking her dog for walks along the water whenever possible. 

Merrimack Dental Dentist

Dr. Ralph Guercio, DDS



Dr. Ralph Guercio established Merrimack Dental Associates when he moved to New Hampshire in 1977 after completing his Dental training at the University of Maryland. For the next forty years, he practiced general dentistry at the same location where the office continues to treat the members of its community today. 


Following his retirement from clinical practice in December 2017, Dr. Guercio has spent much time traveling the world, skiing and enjoying time with his family.