"Wherever she goes, whatever she does, admiring and envious eyes follow this lovely girl—until she smiles! And then, shock and disillusionment and only the ghost of beauty," reads the text of this 1936 ad for Ipana Tooth Paste. "It seems impossible that one so fair and so fastidious should let dingy teeth and tender gums cloud her loveliness. And yet how often it happens—and how often you have seen it happen." Fast forward to over seventy years later: Society still expects women to have gleaming white choppers. Click picture for a full-size view. [ModernMechanix]