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William Addis of England
is believed to have produced
the first mass-produced
toothbrush in 1780.

In 1770, he was jailed
for causing a riot.

While in prison he decided
that using a rag with soot and
salt on the teeth was ineffective
and could be improved.

One evening, he saved a
small bone from a meal.

He drilled small holes into the bone
and tied tufts of bristles
(obtained from one of the guards)
into the holes in the bone.

Then he sealed the holes
with glue.

After his release
he started manufacturing
toothbrushes, a business
which made him verifiably wealthy.

  Bill Yarrow