If you did not already know, this is generally the recommended brushing time. 2 minutes, twice a day. The heads are interchangeable, so you can select your preferred head and use it with any of the cleaning modes, although some work best with particular modes. Some Sonicare and Colgate models do actually achieve up to 3 weeks, but Oral-B are now much much closer in their capabilities. When you brush, sensors within the brush detect if you are applying too much force to your teeth. When it detects this, it activates the pressure sensor.

The likelihood is that it would survive, but I strongly advise you avoid submerging the brush below water, for example in a bath or sink. A rinse is fine, but the brush does not need to sink to the bottom of a bowl of water. The very nature of being an electronic item with moving parts does indeed make the brush susceptible to failure. However, the reliability of Oral-B products tend to be very good. This price does exclude the cost of water, toothpaste and electric to charge it. This price also works on some assumptions, but you get a rough idea.In our testing, we were able to get 66 minutes of usage time from the rush, which equates to 16 days use. You can find much more detail on each mode and how they compare in our article, Oral-B cleaning modes explained.

In the unlikely event, something goes wrong, there is as standard a 24 month warranty is provided with the 4000. This covers the battery too. Register the brush online and you get an extra 12 months at no extra cost, so 36 months or 3 years in total. If you didn’t know this or are guilty of not brushing for as long as you should, the Smart 4 can help in 2 ways.

You can bring the cost down further if you were to share it with other members of your household. All you need do is invest in extra brush heads. Sadly with this Oral-B smart toothbrush, you will need to hold the smartphone or come up with your own mounting solution in the bathroom. Prices will vary from store to store. Quite often online retailers will have the best price, but promotions run by high street stores at certain times of the year will see them come inline or cheaper than other retailers.