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How to keep a clean toothbrush
Do not store your toothbrush in a closed container at home.
The greater moisture in a closed container creates a good environment for the growth of bacteria.
Keep your toothbrush in a container when you travel to avoid it picking up dirt or bacteria.
Be sure your toothbrush is dry before putting it in the protector or case. Also, be sure to clean your toothbrush protector regularly.