Listerine was invented in 1879 as a surgical antiseptic, named after Joseph Lister. Over the following decades it was sold as a floor cleaner, a treatment for gonorrhea, and a cure for dandruff. Sales were modest.
In the 1920s Gerard Lambert, whose father had bought the formula, went looking for a market and found a word.
Halitosis was a genuine but obscure medical term for bad breath, appearing in journals and almost nowhere else. Lambert built a campaign around it, and the campaigns are famous. Often a bridesmaid, but never a bride — a young woman named Edna, approaching her thirties, whose friends are all marrying, and who does not know why nobody proposes. Her closest friends will not tell her. Halitosis makes you unpopular.
Company revenues rose from around a hundred thousand dollars a year to over eight million within about seven years.
The mechanism has a specific and cruel structure, and it is worth stating precisely because it is still the standard method in several industries.
The defect is unverifiable by the person who has it. You cannot smell your own breath. There is no test you can perform, no mirror you can consult, and — this is the crucial half — nobody will tell you, because it is too embarrassing. The advertisements said so explicitly: your best friend won't tell you.
That combination produces a condition that cannot be resolved by evidence. Festinger's social comparison theory holds that in the absence of objective standards, people evaluate themselves by reference to others — and here the reference is unavailable by construction, because the whole premise is that others are concealing their judgment.
What is left is permanent, low-grade, unresolvable social anxiety, and a product that quiets it temporarily and must therefore be repurchased.
The medical term did the second job. Halitosis is not a description; it is a diagnosis, and it converts a variable feature of being a person into a pathology with a name, an implied etiology, and a treatment.
The template has been reused continuously since. Body odor as a named condition. Dandruff. Chronic dry eye. Manspreading of the pores. Whatever the current formulation is for the state of one's gut. In each case the pattern is the same: an unverifiable self-relevant defect, a name that sounds clinical, and an implication that other people have already noticed.
The diagnostic question is the one Listerine's campaigns were built to prevent you from asking: before I saw this, was this a problem I had?
Cross-ref: Defense — Auditing Manufactured Need