1.statistics unreliable
(1) size, representative,
(2) not from formal records but memories
2.no detail information of the rate of the gender and the degree of the pain, maybe male suffered more
3.advertisement suggestion unconvincing
(1)unfairly target at male consumer, maybe the female patients are more
(2)the focus may disobey most patients intention of techniques of dentist, the two mentioned maybe the basic items.
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