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Science pronounces that 3 minutes is the best time for brushing teeth. However, most people are not willing to persist in because of too many foams in mouth or waste of time. This toothbrush can solve this problem effectively. The toothbrush adopts hollowing design so that the foams in mouth can flow into the inside of the toothbrush and be stored. You can watch TV and brush your teeth at the same time in 3 minutes, making it more meaningful to wait. And it can also urge you to persist in brushing your teeth for 3 minutes and gain the best effect.