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。
Includes: 1 Sonic Toothbrush with brush head, 1 UV-Sanitizing charger base, 3 total replacement brush heads.
包括：1声波牙刷刷头，1紫外线消毒充电器基地，3共计更换牙刷头。
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