When was the toothbrush invented?

The creator of the first mass-produced toothbrush is believed to have been William Addis of England in 1780. Addis had been jailed in 1770 for inciting a riot. In jail, he developed a toothbrush consisting of an animal bone and bristles made of pigs' hair that were inserted into drilled holes and held in place by glue. After his release, he started a toothbrush manufacturing company called ADDIS that stayed in his family until 1996 and still manufactures toothbrushes today.