American Dental Hygienists Association:  http://www.adha.org/

Malpractice Insurance: 

http://www.adha.org/sites/default/files/74110_Membership_Affinity_Programs_1.pdf

ADHA Membership Application:  http://www.adha.org/sites/default/files/7411_Membership_Application_1.pdf

ADHA Student Conversion: http://www.adha.org/resources-docs/ADHA_Student_to_Professional_Online_Instructions.pdf

Maryland Dental Hygienist Assoc.: http://www.mymdha.com/

Montgomery County DHA: http://www.mcdha.org/

Maryland Board Of Dental Examiners:

http://): www.dhmh.state.md.us/dental

DC Dental Board:https://doh.dc.gov/service/dentistry-licensing 
Virginia Board of Dentistry: https://www.dhp.virginia.gov/dentistry/

Virginia Dental Hygienists Association:https://vdha.wildapricot.org/

Northern Virginia DHA: http://nvrdh.com/

Dental Assisting National Board:https://www.danb.org/