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The Oral-B iO Series 4 is a rechargeable sonic-style electric toothbrush with a round brush head and soft bristles. It brings Oral-B's magnetic iO drive and pressure sensor down to the entry point of the iO line, so you get the core cleaning tech without the extra modes and display of the iO Series 5 and up. It suits people moving from a manual brush or a basic oscillating model who want guided brushing and a pressure warning. Owners rate it highly for cleaning feel and battery life; the main complaints are the loud motor and the cost of replacement heads.
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Lowest price we've seen: $65.00 on Nov 13 at mercari.com. Tracked across 13 stores since Nov 13.
Buyers rate the iO Series 4 highly, praising the clean feel and the pressure feedback that helps them stop brushing too hard. Complaints center on the noise and the ongoing cost of brush heads.
