title: Edgar Rudolph "Painless" Parker (1872-1952). The "P.T. Barnum" of dentistry. Part I: Canadian beginnings.
mesh_terms: D002170:Canada; D003813:Dentistry; D049672:History, 19th Century; D049673:History, 20th Century; D011781:Quackery / Q000266:history; D014081:Tooth Extraction / Q000266:history