In 1770, Addis was imprisoned in Newgate prison for causing a riot in Spitalfields.[4] While there, and observing the use of a broom to sweep the floor, he decided that the prevalent method used to clean teeth at the time – crushed shell or soot – with a cloth was ineffective and could be improved. To that end, he saved a small animal bone left over from the meal he had eaten the previous night, into which he drilled small holes. He then obtained some bristles from one of his guards, which he tied in tufts that he then passed through the holes in the bone, and which he finally sealed with glue.[citation needed]
After his release, he started a business to manufacture the toothbrushes he had built, and he soon became very rich. He died in 1808, and left the business to his eldest son, also called William, and it stayed in family ownership until 1996.[5] Under the name Wisdom Toothbrushes, the company now manufactures 70 million toothbrushes per year in the UK.[6]
By 1840, toothbrushes were being mass-produced in England, France, Germany, and Japan.[7]
Hertford Museum holds approximately 5000 toothbrushes that make up part of the Addis Collection. The Addis factory on Ware Road was a major employer in the town until 1996. Since the closure of the factory, Hertford Museum has received photographs and documents relating to the archive, and collected oral histories from former employees.[8]
Notes
^Most online sources refer to "Clerkenwald", but no such place exists; references to Clerkenwald appear only in text about Addis; and his early history is in East London.
