Enroll in our annual renewal or quarterly payment plans! If you have any questions regarding your renewal, please do not hesitate to contact us via email at email@example.com. Calling (312) 440-8900 (press 1 for member services). Volunteer Leadership positions are open for McHenry County Dental Hygienists' Society. Contact us at MCDHShyg@gmail.com. Welcome to the McHenry County. Dental Hygienists' Society page. McHenry County Dental Hygienists Society.