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小真是个喜欢吃甜食的小女孩，经常不刷牙，这可累坏了负责小真牙齿健康的牙婆婆。牙婆婆住在小真的嘴里面，负责清扫小真的牙齿。可是小真常常不刷牙，牙婆婆终于不堪重负发怒了！如果不好好刷牙，假牙婆婆就会出现！
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