Superseded95% confidenceFactTime unknown
牙刷无论手动还是电动，刷毛磨损或使用满3个月即需更换，刷毛外翻会显著降低清洁效率并损伤牙龈
1
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95%
Confidence
Long-term
Relevance
-
First Seen
This knowledge claim has been superseded by newer content
电动牙刷刷头无论是否磨损都应每3个月更换，刷毛磨损后清洁效率下降30%以上，带蓝色/绿色指示毛的刷头褪色50%即为更换信号Sources
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