Which famous historical hygiene myth was entirely fabricated by early advertising executives to sell products?

The “Filthy Middle Ages” Story Was a Sales Pitch

The familiar claim that people in medieval Europe never bathed is the hygiene myth often tied to early soap advertising. It made the past look uniformly dirty—and modern cleanliness look like a product people could buy.

That contrast was useful to advertisers. If consumers could be persuaded that ordinary washing was a mark of civilization, soap was no longer just one way to clean: it became proof that a household was respectable and up to date. Ads could sell the product by selling a story about what cleanliness meant.

A Real Past, Flattened Into a Slogan

The historical record does not support the blanket picture of a whole era that never washed. Bathing habits varied with place, period, access to facilities, and ideas about health. Public baths and other forms of washing existed, even though they were not the same as modern daily bathing.

The advertising trick was to take those differences and erase them. A complicated history became a simple before-and-after tale: people once lived in filth; soap brought cleanliness. The myth worked because it turned a product into the apparent dividing line between an embarrassing past and a respectable present.