From Hog Hair to Nylon — The Hidden History of Toothbrushes and Trench Mouth

February 24 looks like an ordinary date on the calendar — but it quietly changed the human mouth forever.
In this episode of The Strange History Podcast, host Amy explores the surprising history of the nylon toothbrush, unveiled by DuPont in 1938, and how a simple change in bristle material transformed oral hygiene, reduced disease, and helped eliminate a once-terrifying condition known as trench mouth.
Before nylon, toothbrushes were made from hog and boar hair — uneven, bacteria-trapping bristles so difficult to clean that early dentists advised boiling them between uses. These primitive brushes contributed to gum infections, tooth loss, and the spread of acute necrotizing ulcerative gingivitis, better known as trench mouth — a painful disease common among World War I soldiers living under stress, malnutrition, and unsanitary conditions.
This episode traces how nylon bristles, designed for uniformity and cleanliness, dramatically reduced oral bacteria, improved gum health, and reshaped daily habits like brushing twice a day. It also explores why trench mouth nearly disappeared in the 20th century, how military hygiene accelerated the change, and why synthetic materials were quietly invited into the human body without controversy.
Blending medical history, everyday inventions, and darkly fascinating details, this episode reveals how progress doesn’t always arrive with fanfare — sometimes it just changes the bristles.
If you love strange history, forgotten diseases, medical breakthroughs, and the hidden origins of everyday life, this episode belongs in your queue.
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