The Toothbrush Was Invented in a Prison Cell

London. 1770. A prison cell.William Addis had been arrested. He was bored. And he was looking at his teeth in the reflection of a tin cup, scrubbing them the same way everyone did back then — with a rag and some soot.Then he had an idea. He saved a leftover bone from his dinner. Drilled holes in it. Begged a guard for a few stiff bristles. And invented something that 5,000 years of human civilization had failed to invent.In this episode of Hidden History with Aiden Thomas, we follow the toothbrush from ancient Babylonian chew sticks through frozen Siberian pig hair to the WWII nylon revolution that put a brush in every bathroom with an order to use it daily.It wasn't dental hygiene. It was a prison cell breakthrough.Take a look around. History is everywhere.