Using either a circular or jiggling, up-and-down motion, brush this area with your toothbrush.
牙刷以圆周或者上下簸动的方式来刷这块区域。
More tips: Choose a soft-bristled brush with a small head to get at hard-to-reach spots; brush in circular motions with fluoride toothpaste.
更多提示：选择小头软毛牙刷可用于刷到不易刷到的区域，使用含氟牙膏打圈刷牙。
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