The Genius X comes with Artificial Intelligence (AI) to track the movement of the toothbrush when in use compared to the 9000 that relies on camera tracking. Round head electric toothbrushes oscillate thousands of times per minute, enough to efficiently remove plaque, bacteria and debris while brushing. In terms of functionality and features, the more inexpensive Oral-B Genius X doesn’t differ all that much from the premium iO range, especially when compared to the entry-level iO4 and iO5 brushes. The clincher for the Genius X is that it’s the most advanced Oral-B electric toothbrush to use the standard Oral-B brush heads. Along the lines of little thoughtful elements of your electric toothbrush package, the Oral-B Genius 9900 Electric Toothbrush will alert you when the toothbrush head needs replaced.

Oral-B Genius 9900 Set of 2 Electric Toothbrushes Oral-B Genius 9900 Set of 2 Electric Toothbrushes

Those who have yet to sample the delights of an electric toothbrush often have a misunderstanding of the recharging process.The brush head also has a cross in the middle of the bristles, made from silicone, which helps whiten and polish the teeth as you brush, and all our testers felt that this addition was very effective in getting rid of longer-term stains. Before going further, it is sensible to make you aware of the Bluetooth technology which is associated with the Oral-B Genius 9900 Electric Toothbrush. The app is less kid-friendly than the Oral-B equivalent and won't shower you with emojis and awards for a job well done, but it will give you personalized tips, track your brushing technique and allow you to monitor it over time.

Oral-B Genius X vs. 8000 vs. 9000 vs. 10000 | Differences Oral-B Genius X vs. 8000 vs. 9000 vs. 10000 | Differences

Although I didn’t find the app particularly useful, the Oral-B Genius 9000 is a top toothbrush offering excellent value. Dentists recommend a wide range of electric toothbrushes, and depending on which brand you ask you’ll get a different answer. Another subtle difference on the back of the change in motor is that the iO now offers micro vibrations compared to the pulsations that are offered on the 9000. The brush's charging case is excellent, with room for two heads rather than just one, and a choice of charging options. Its cleverly designed charging case is a highlight too, and gives regular travellers extra options for keeping their brush powered up.

Some people report being more focused when cleaning their teeth with an electric toothbrush and kids tend to find them more fun – especially if there are associated child-friendly apps involved. And, as my last point about the brush heads has highlighted, the Genius X comes in 3 main colour options.