Office Hours
8am - 5:30pm
12pm - 7 pm
8am - 5:30pm
8am - 5pm
Phone 410-838-7070

Meet Our Team


Dr. John Duguid, D.D.S.
A Bel Air native, and graduate of Bel Air High School, Dr. Duguid completed his formal dental education at the University of Maryland Dental School. After graduation, he served for the U.S. Army reserves as a dentist for eight years before establishing his practice in his hometown. He is an active member of the American Dental Association, the Maryland State Dental Association, and several other professional organizations. Dr. Duguid is a firm believer in preventive and conservative dental care. When he’s not caring for his patients, Dr. Duguid enjoys jogging, working outdoors and tinkering in his garage. He and his wife have three children, and six grandchildren.


Cyndi Knight Cyndi Knight, Office Assistant
A lifelong resident of Harford County, Cyndi was born at Harford Memorial Hospital and graduated from Aberdeen High School. God has blessed her with a beautiful daughter, Morgan, and two amazing grandsons, Zane and Damian. Cyndi loves the beach, lighthouses, reading romance novels, watching old movies from the Golden Age of Hollywood, HGTV and the Food Network. Her favorite vacation destination is Maine, specifically the DownEast area and Acadia National Park, but she loves all of New England. Cyndi’s favorite sports teams are the New England Patriots, Boston Red Sox, and Boston Bruins.



Teri Sigart Teri Sigwart, Registered Dental Hygienist





stacy_150Stacy Bonsall, Certified Dental Assistant
A Certified Dental Assistant for over 18 years, Stacy can be found chair-side as the extra set of hands
during Dr. Duguid’s dental procedures. Stacy loves the opportunity to work with such a great staff at South
Main Street Dental, and aides Dr. Duguid in prepping patients, taking X-rays, sterilizing equipment, and
more, to ensure that everything goes smoothly for the patient. Stacy encourages her patients not to forget
to floss, and says her favorite polish flavor is bubble gum. In her free time, Stacy enjoys listening to country
music, spending time with her grandson, Blake, and spending time with her family and friends.