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Crows drink water toothbrushes are designed to help young children develop the habit of brushing their teeth for 3 minutes from an early age. To stimulate children's interest and enthusiasm in brushing their teeth through the story of “crow drinking water”.This toothbrush has a special liquid in its handle,when the handle is held, the liquid absorbs heat and expands. After 3 minutes will make that ‘crow ’drink water, the children knew brushing finished.