"The greatest reward is seeing what a tremendous difference the treatment makes to low-income adults who, in some cases, have been in tremendous pain as a result of putting off dental work, often for several years," said Clark.
Patients also receive oral health education and a free hygiene pack so they can maintain the health of their teeth after the procedure.
"It's tremendous knowing that over 700 people will receive no-charge dental treatment through Smile NZ Free Dental Days this year," said Clark.
The Southern Cross Health Trust funds dental practices for the use of premises, equipment and dental assistants.
Clark said her Northland practice joined 60 other NZDA member dentists who are donating their time for the scheme.
This year will also mark Gentle Dental Ruakākā's third year of being involved with the scheme.
To book an appointment, patients must have a Community Services Card number.
Do not contact the dental practices directly, they aren't involved in making the bookings.