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How to store electric toothbrush heads
Store your brush in a travel case if it comes with one.
Some electric toothbrushes come with a travel case, though these models may be more expensive. Some allow you to store multiple heads in the case, so that if you are on a long trip, you can bring extra heads with you to replace them while you're gone.
Philips sonicare 2 series and quip electric toothbrushes both come with easy to use travel cases. Get a generic travel case if your electric toothbrush didn't come with one.