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Oral-B iO Toothbrush Series 3 VS Series 4

As you might expect, the iO Series 3 is effectively the brilliant iO Series 4, only without the smart features and Bluetooth connectivity needed to work with Oral B’s iO app. It has the same iO-Series magnetic drive and supports the full range of iO brush heads. It has a smart pressure sensor that glows blue to red to track how hard you’re brushing, along with three brushing modes. It comes with Oral-B’s basic 2-pin charger plus an equally plain and basic plastic travel case. Only one brush head is supplied, so you’ll need to pay extra for spares or replacements. In terms of design, the iO Series 3 is virtually identical to the iO Series 4. The Series 4 is ever-so-slightly taller and thicker, but there’s only a couple of millimetres in it. It also has an extra brush mode – super sensitive – but I suspect most people will be fine with the Series 3’s trio of daily clean, sensitive and whitening.