I used to just use string floss. Then by pure chance I ran into Zhao Dazhu’s wife on Twitter — Auntie Pliers, if you know — talking about water flossers. I got curious and asked about it, and it turns out the thing seemed pretty damn good. Not expensive either. Okay, there are pricey ones too. But I figured there was no point paying more, so I just went and bought it. Bought it through Amazon Global; 251 yuan delivered, no customs charge, just waiting on the tax refund.