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.
而且出于卫生需要，索纳斯二代变频电动牙刷的刷头都自带一个透明刷头盖，用于日常的防尘！
But for health needs, the brush head Souness two generation of inverter electric toothbrush comes with a transparent brush for daily dust cover!
每三个月把新的牙刷头寄到你邮箱里的服务。
A service that delivers a new toothbrush head to your mailbox every three months.
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