Focal Infection Theory — Millions of Needless Extractions and Colectomies That Killed Over 30%

The focal infection theory was launched into the medical mainstream by British surgeon William Hunter, whose 1900 papers on “oral sepsis” and his incendiary 1910 lecture at McGill University in Montreal told physicians that the worst cases of anaemia, gastritis, colitis, “obscure fevers and nervous disturbances” owed their origin to septic foci hidden in the mouth — and it was popularized in America by Chicago physician Frank Billings, who renamed it “focal infection” in 1911-12. The promise was a unifying key to chronic disease and even insanity; the reality was that removing the supposed foci cured nothing, and the search for them maimed and killed. The gap between the elegant hypothesis and the operating-table arithmetic would, over four decades, cost an unknowable number of teeth measured in the millions and, at one New Jersey asylum, the lives of more than three in ten patients sent to surgery.

The theory’s most lethal apostle was Henry Cotton, medical director of the New Jersey State Hospital at Trenton from 1907 to 1930. Convinced that insanity was at bottom a toxic disorder seeded by occult infection, Cotton pulled teeth wholesale, then escalated to tonsils, sinuses, cervixes, ovaries, testicles, gall bladders, spleens, stomachs, and — most fatally — sections of colon. He publicly claimed cure rates of 85-87%. He also conceded, in print, mortality “as high as 30%” on his abdominal cases; Andrew Scull’s archival reconstruction in Madhouse (2005) put the colectomy death rate above 30% and the true overall surgical mortality nearer 45%. Cotton’s answer to those deaths was that the insane simply possessed “a much lower vitality.”

The reversal did not arrive as a single ban but as the slow accumulation of negative evidence the theory could not survive. A 1924-25 investigation commissioned from psychiatrist Phyllis Greenacre by Cotton’s own mentor, Adolf Meyer of Johns Hopkins, found his record-keeping “chaotic,” his data internally contradictory, and his cures unsupported — yet Meyer suppressed the report and Cotton operated on. The decisive blows were epidemiological: Russell Cecil and D. Murray Angevine’s 1938 analysis of 200 rheumatoid-arthritis cases in the Annals of Internal Medicine found “no consistent cures by tonsillectomies or tooth extractions,” and Hobart Reimann and W. Paul Havens’s 1940 review concluded tooth removal “must still be regarded as an experimental procedure not devoid of hazard.”

This dossier files “Overturned” entry TH-010 because the revoked object is the idea itself — a causal theory of disease, not a single recalled device — and because its revocation is the cleanest specimen of a plausible mechanism, never tested before it was applied, that controlled study quietly demolished only after it had already emptied tens of thousands of mouths and filled a hospital cemetery.