As far as i can understand from this link http://www.pophistorydig.com/?tag=norman-rockwell-rosie-the-riveter, the only poster of the image that was made was for advertising the issue of the Post, and was promptly retracted through copyright fears. But I might have misunderstood the text?
The was another Rosie the Riveter poster - more pin-up-like (Rockwell's Rosie does look like she could do the job), by an artist called Miller - that might have become better known, as I understand my linked to website.
The Americans continually speak of "European teeth" as the result of bad dental hygiene. Where I grew up we spoke of "American teeth" for the same thing - we were told there were many US teenagers with false teeth... but maybe that explains the whiteness - and the regularity?
My impressions are never anything to go by, but if British cash is spent on cosmetic enhancement, it's mostly spent on the softer bits. Wasn't a book of "British Smiles" used to frighten the Simpson children into visiting the dentist? One of Marge's better ploys.