The SmartSeries range of toothbrushes is the mid-range option from Oral-B. The Vitality and Pro ranges are cheaper, while the Genius and iO ranges are more expensive and have more innovative tech.
The SmartSeries range is defined by the real-time feedback you’ll get when brushing using the app, as well as the wide range of cleaning settings. The 6500 is the top-end toothbrush within the range – the alternatives are the 4000 and the 5000 which have fewer brushing modes.