The Series 8 has 6 cleaning modes (daily clean, sensitive, super sensitive, intense, whiten & gum care) compared to the 5 of the Series 7 (daily clean, sensitive, intense, whiten & gum care). The extra mode the iO8 has is super sensitive. Of course, the table and quoted prices are just a guide. The actual selling prices vary from one retailer to another. The Series 5 has 5 cleaning modes (daily clean, sensitive, super sensitive, intense & whitening) compared to the 4 of the Series 4 (daily clean, sensitive, super sensitive & whitening). The extra mode the iO5 has is intense.

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Each of the modes use different amounts of power from the motor. This impacts the angle of oscillation at the bristle tips to create brushing patterns and effects that are different from one another. The iO3, 4 and iO5 have a yellow light that illuminates in the centre of the cleaning mode button. The handle will vibrate too. All system components (e.g., toothbrush handle, charger, power cord, SmartGuide). You do not need to include accessories like the brush heads or refill stand.The iO5 comes with a refill holder that holds and protects 2 brush heads. The iO4 does not come with this. The Series 9 comes with a power2go charging case that allows the iO to be charged inside whereas the Series 7 comes with a standard travel case. A brush head should be replaced after about 3 months. After this, the bristles clean less effectively and are more abrasive on the teeth and gums. There may also be an increased amount of bacterial build up. You can change the cleaning mode on the iO5 before turning the brush on. You can't do this on the iO4. All things considered, the differences between each model in the iO Series range are relatively subtle.

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All of the iO Series brushes have a 2 minute timer, pacer and pressure sensor. These are the key features that dentists recommend. Those with displays show a battery icon and a percentage of the remaining charge after each brushing session. Included with some models is an accessory known as the brush head refill holder. This is a little stand cum travel case for brush heads.

The iO10's pacer is often set to 20 second (sextant) intervals compared to the 30 second (quadrant) intervals of the iO9. Your brushing time and technique have a far bigger impact on the cleaning results than the mode you use. Jon bushes teeth with iO3 that brushes as well as any other iO model Various price points to suit different budgets