The first nylon bristled toothbrush with a plastic handle was invented in 1938(8)

The first nylon bristled toothbrush with a plastic handle was invented in 1938(8)

The first nylon bristled toothbrush with a plastic handle was invented in 1938(8)

Toothbrush bristles can harbor bacteria, so you should rinse your brush in hot water after each use, and replace it after you have been sick, or every three months regardless.

User: Newalbanyimplants Web

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Uploaded: 2014-04-30

Duration: 01:07