Edward T. Lawler, DDS Billings, MT May 2006 to Jun 2013 Dental HygienistRichard Prill, DDS Billings, MT Jul 2001 to Nov 2001 dental assistantMonday through Thursday, weekly, Pedodontics Practice, Hamilton Jones, DDS Denton, TX Jun 1990 to Apr 1992 Registered Dental Hygienist