Which invention was transformed from a medical product to a beauty essential through a revolutionary 1920s advertising campaign that coined the term 'halitosis'?

The world of inventions isn't just about creating products, but also about how they're marketed to consumers. Some marketing campaigns have been so innovative that they fundamentally changed how we perceive certain products, turning inventions into cultural icons. This trivia question explores one of the most successful marketing transformations in product history, where brilliant advertising completely repositioned an invention in the public consciousness.

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