Hygienists changed the profession.
Giangrego
Elizabeth
E
D003756:Dental Hygienists / Q000266:history*; D003777:Dental Prophylaxis / Q000266:history*; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D009910:Oral Hygiene / Q000266:history; D014481:United States