The first toothbrush to resemble the modern toothbrush is believed to have been invented in China in the late 1400s,[2] which used the stiff hairs from a hog's neck, attached to a bamboo stick.

But we Idians use Banian tree sticks and Neem tree sticks from time immemorial .

That must be considered as a tooth brush of hygene and Natural one.So I feel proud to say we Indians invented first tooth brush.

The toothbrush as we know it today was not invented until 1938. However, early forms of the toothbrush have been in existence since 3000 BC. Ancient civilizations used a "chew stick," which was a thin twig with a frayed end. These 'chew sticks' were rubbed against the teeth.

The bristle toothbrush, similar to the type used today, was not invented until 1498 in China. The bristles were actually the stiff, coarse hairs taken from the back of a hog's neck and attached to handles made of bone or bamboo.

Boar bristles were used until 1938, when nylon bristles were introduced by Dupont de Nemours. The first nylon toothbrush was called Doctor West's Miracle Toothbrush. Later, Americans were influenced by the disciplined hygiene habits of soldiers from World War II. They became increasingly concerned with the practice of good oral hygiene and quickly adopted the nylon toothbrush.

Interesting toothbrush facts:

The first mass-produced toothbrush was made by William Addis of Clerkenwald, England, around 1780.
The first American to patent a toothbrush was H. N. Wadsworth, (patent number 18,653,) on Nov. 7, 1857.
Mass production of toothbrushes began in America around 1885.
One of the first electric toothbrushes to hit the American market was in 1960. It was marketed by the Squibb company under the name Broxodent.

Chinese people invented it

Our ancient method was to use the neem sick which is ver scientific.

This shoud be by cjhinese .In india we are known for using neem stick

Viiage people used always natural tooth brush....this called tamil kuchi....