Columbia subject headings:
Dentistry--Research--Canada--Periodicals.
Dentistry--Research--Great Britain--Periodicals.
Dentistry--Research--Periodicals.
Dentistry--Research--United States--Periodicals.
Harvard subject headings:
Dentistry--Research--Canada--Periodicals.
Dentistry--Research--Great Britain--Periodicals.
Dentistry--Research--Periodicals.
Dentistry--Research--United States--Periodicals.
Princeton subject headings:
Dentistry--Research--Canada--Periodicals.
Dentistry--Research--Great Britain--Periodicals.
Dentistry--Research--Periodicals.
Dentistry--Research--United States--Periodicals.