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1 牙刷的选择 牙刷是口腔卫生保健用具,只有选用符合口腔卫生要求的保健牙刷,才能保证刷牙的效
The choice of a toothbrush Toothbrush is oral health care appliances, only the use of health care toothbrush in line with oral hygiene requirements, to ensure brushing effect