牙刷或者电动牙刷刷头应每三~四个月更换一次——如果未到时间，刷毛已经磨损或是变形，那么请及时更换。
Invest in a new toothbrush or a replacement head for your electric or battery-operated toothbrush every three to four months - or sooner if the bristles become frayed.
牙刷或者电动牙刷刷头应每三~四个月更换一次——如果未到时间，刷毛已经磨损或是变形，那么请及时更换。
Invest in a new toothbrush or a replacement head for your electric or battery-operated toothbrush every three to four months - or sooner if the bristles become frayed.
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