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Users insert the brush head that bears the number 6 from the set of 12 brush heads in the handle of the toothbrush in June. They compare the number of the toothbrush reflected in the bathroom mirror with July casually while brushing their teeth in July and find the toothbrush has been used for one month or more. As the toothbrush tells the use period, it becomes the standard of how the users indirectly measure the contamination level and naturally leads to the periodic replacement of the brush head.
Seoul, South Korea