With a usual retail price of £210-250, the iO series 8 is available for the rest of the day for £189.99. The iO is the first brush to have a full-colour OLED screen to display battery life, brushing mode and more. It cleans via micro-vibrations to give Oral-B's best-ever brushing performance. In the box, you'll get the handle, brush head, magnetic charger, travel pouch and spare brush head case. 

We just reviewed the slightly never model, the iO9, if you'd like to find out more about the brush.  

Amazon is also selling the Oral-B Genius 8000 for £69.99. It currently retails for around £100-£150, so if you buy now, you'll save 30-50%. That's a very good discount.

You can buy it in rose gold, silver or black. In the box, you'll get the brush handle, three brush heads, a charger, a travel case and a smartphone mount.

Oral-B is one of the most reliable electric toothbrush brands and this is one of the brand's best models. The Genius 8000 is an app-connected brush that offers feedback on your technique. It has five brushing modes (daily clean, gum care, sensitive, whitening and pro clean) and its smart ring doubles as an alert to let you know when you're brushing too hard.

Its lithium-ion battery has a life of approximately two weeks before it needs charging. The app is free to download and use, and very straightforward as well.

We reviewed the Genius 8000 and rated it 4.5 out of 5 stars.

To find out more about Prime Day, check out our guide, which includes deals published early. We've also got all you need to know about the Amazon Prime service, including how to get a free trial. To see all of the best deals available now, check out our big deals round-up.