National Dental Association -
The NDA promotes the US public's health through the commitment of member dentists to provide quality oral health care, accessible to everyone.
http://www.ndaonline.org/

National Institute of Dental and Craniofacial Research -
The mission of NIDCR is to promote the general health of the American people by improving their oral, dental and craniofacial health.
http://www.nidcr.nih.gov/

National Naval Dental Center -
Conducts advanced programs for dental officers that are designed to help the Dental Corps meet its need for fully qualified personnel.
http://nnd40.med.navy.mil/

Nevada Dental Association -
The NDA is an organization for dentists in the State of Nevada. The organization offers up-to-date dental information for dentists, as well as conference and meeting event information.
http://www.nvda.org

New Mexico Dental Association -
List of all dentists in the state, oral health FAQs, membership information.
http://www.newmexicodental.org

New York Dental Assistants Association -
Includes history, news, membership information, and events.
http://www.newyorkdentalassistantsassociation.com/

New York State Dental Association -
Includes membership information, news, continuing education courses, legislative news, and publications list.
http://www.nysdental.org/

Nova Scotia Dental Hygienists Association -
Includes membership information, history, component societies, and publication information.
http://www.nsdha.ns.ca/

Ohio Dental Hygienists' Association - Offers membership information, continuing education schedules, association event calendar, and list of officers.
http://www.odha.net/