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South African girl wins International Science Expo

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South African girl wins International Science Expo

Chené Mostert from Hoërskool Ladysmith in KwaZulu-Natal invented a sterilization appliance for toothbrushes after she tested 150 different toothbrushes and found more than 100 different types of bacteria that grew on them.

The invention consists of  hydrogen peroxide in a plastic container with 4 tubes to house the toothbrushes and a rotating system that scrubs the toothbrush when turning the handle manually. The container then also closes with a lid to prevent any further contamination with bacteria. Hydrogen peroxide is the safest sterilization chemical and does not leave a bad taste in the mouth.

Original article: www.beeld.com

Image source: www.beeld.co.za
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