Amazon上，Waterpik电动水牙线的好deal还在，Cordless便携水牙线$59.99

很多款都是好价 https://www.amazon.com/stores/page/2FCDAD2E-C0A1-46FC-910C-742FBACC2E8E/
Cordless手持水牙线$59.99，白色的，这款很好用 https://www.amazon.com/dp/B01GNVF8S8