What do tree branches, wild boar hairs and nylon have in common? The bristles of a toothbrush have been made from these items. People have been concerned about their dental hygiene since Egyptian times. Ancient tombs contained small tree branches whose ends had been frayed into soft fibers. In the 15^th century, the Chinese made toothbrushes from the neck hairs of a Siberian wild boar. The present-day nylon toothbrush wasn’t invented until 1937.

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