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你们的电动牙刷头都多久换一次？
source link: https://www.v2ex.com/t/564241
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生活 - @Exp - 飞利浦的电动牙刷收入中的利润应该有很大一部分来源于牙刷头吧，看到牙刷头的价格都那么贵。。。厂家给出的建议是，牙刷头三个月一换。但是钱包告诉我还是再继续用用吧，所以我都是接近于一年一换。。。
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