Image: Le Baume d'Acier by Louis Leopold Boilly. Courtesy of the US National Library of Medicine.
BEAUTY, HEALTH, and a PEARLY SET
of TEETH, may be preserved to old age, by
the use of BUTLER's VEGETABLE RESTORA-
(Image from Gray's Anatomy, 20th US Edition 1918.)
There's a sub-species of urban myth specifically related to "the olden days," and one of its pronouncements is that everyone before about 1950 had appallingly rotten teeth. That's if they were lucky...