Dr. Wyeth advertisement in the Washington Times – April 28th, 1911
Pretty sweet ad — “I Make Sick Teeth Well” — captures your attention and tells you what you want. Fix my teeth.
Also, this guy had offices everywhere, with an office in Washington, Baltimore and Philadelphia? Check out a Flickr then and now shot of the address, 427 7th St. NW (although, the then is only 1979).