[Expired]Oral-B iO Series 9 Electric Toothbrush With 4 Brush Heads,

: The battery life is short and it's noisy. It cleans a bit better than Philips, but I'm really disillusioned with electric toothbrushes now. Recently, I took someone's recommendation and bought a Japanese EBIOS toothbrush. Manual toothbrushes can be super effective too—lots of toothpaste foam and a thorough clean. 电量短，声音大，比飞利浦刷的干净一点，但是我现在真的对电动牙刷去魅了，最近吃别人安利买了日本的惠百施，手动牙刷也可以超好用，超多牙膏末，刷的很干净

: No need to buy the flagship version. Costco sells a two-pack at a much lower price. 没必要买旗舰款的。Costco有卖两支装的便宜很多。

: Its lifespan is only a little over a year. For some reason, it stopped charging. 这寿命也只有一年多. 不知为何就充不上电了

: What are the 7 modes? Also, which color is more stain-resistant? 7种模式都有啥呀，还有哪个颜色比较耐脏