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Oral-B Smart 4 4000 Review

What is the Oral-B Smart 4 4000 electric toothbrush, what are its key features and how does it differ from the Oral B 4 4500 and other top models? Keep reading to the end to find out.

If you are looking for the best value Oral B electric toothbrush with Bluetooth connectivity then the Oral B Smart 4 4000 is the one to have.

It comes as the Oral B Smart 4 4000N CrossAction, 4 4000w 3D White and 4 4000S Sensitive rechargeable electric toothbrush.

Basically it is the brush heads that differentiate the naming of one Oral B Smart 4 from the other. All other features as discussed below are the same in all of them.

  • The 3D White brush head is for people who want to whiten their teeth using an electric toothbrush
  • Sensitive is for people with sensitive teeth and gums and the
  • CrossAction is default and most recommended Oral B brush head for normal use

Its Key Features

  • Bluetooth Connectivity
  • Pressure sensor
  • 2-minute built-in timer with pacer
  • 3D Cleaning motion
  • 3 Cleaning modes: daily clean, sensitive and whitening
  • 2 weeks battery life using Lithium-Ion battery
  • 2-year warranty that can be extended to 3 by registering your brush on Oral B website
  • 2 brush heads: CrossAction and Sensitive


  • No travel case included
  • No Smartphone holder

Bluetooth Connectivity

The Bluetooth connectivity is one of the most desired features by people who want to take the teeth cleaning to the next level.

What this feature does is that it let you connect your toothbrush to the Oral B app via Bluetooth.

You basically download the app from iTunes or Google Play store, install it on your Smartphone or tablet and use Bluetooth to connect it with your brush.

When it is time to brush your teeth, you put the app on.

What the app does is, it tracks how often and long you brush your teeth, which mouth area do you concentrate more and if you are brushing too hard or not in real-time. It then offers guidance on how to brush your teeth and gums properly.

Pressure Sensor

How do you know that you are brushing your teeth too hard or not? `If you do not know, this is the feature to have.

The Oral B Smart 4 has a sensor on its handle that lights up red when you brush your teeth too hard.

With the electric toothbrush, your job is just to guide the brush to do the cleaning. No scrubbing or applying too much effort as you do with the manual toothbrush.

With the help of this feature, it is easy to know how to adjust the pressure you put on the toothbrush.

2 Minute Timer with a Pacer

Like any other Oral B electric toothbrush, this brush also comes with a built-in 2-minute timer with a pacer that buzz every 30 seconds to remind you to move from where your brushing to another mouth area.

With a mouth having 4 quadrants, you need to give equal time to each quadrant and the buzzing pacer helps you to do that. The timer is also there to make sure that you brush your teeth within 2 minutes recommended dentist brushing time.

3D Cleaning Motion

In Oral B toothbrushes, there are 2D and 3D cleaning actions. The 2D movement involves rotating and vibrating when brushing your teeth, while the 3D includes pulsating into the movement. With the 3D movement, the brush has the ability to remove up to 100 per cent tooth plaque (https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/605266/Delivering_better_oral_health.pdf) than the 2D action found in the low end, cheaper Oral B toothbrushes.

Good news, the Oral B Smart 4 4000 offers this advanced 3D cleaning action where you teeth are being cleaned side by side and up and down while stimulating the mouth to produce more fluids to dissolve hard to reach dental plaque.

3 Cleaning Modes

The cleaning modes are aimed at helping you achieve different cleaning needs. The Oral B Smart 4 comes with 3 modes:

  • Daily clean mode, this is the mode in which your teeth are being cleaned at full power, high speed to remove plaque. It is a default mode for all Oral B electric toothbrushes.
  • The sensitive mode is to be used in times of having sensitive teeth and gums.  If your gums are inflamed and your teeth very sensitive, buying a sensitive brush head with soft bristles to be used along this mode will offer you the best result.
  • Whitening mode as the name goes is for whitening the teeth by not only removing plaque but also scrubbing the surface stains. For better results, you need to buy also a 3D white brush head. The 3D white has a whitening cup on the brush head for polishing the teeth and makes them white.

You change from one mode to the other by pressing the switch on and off button several times while the brush is on your mouth. You just need to remember the order of the modes: daily clean, sensitive then whitening.

The first time you switch on you get the daily clean mode, next switch the sensitive mode then next whitening mode.

2 Weeks Battery Life

The Oral B Smart 4 4000 comes with an improved battery ‘Lithium-Ion battery’ that last longer than the old ‘Nickel Hydride battery’ found in the low-end Oral-B models. The Lithium-ion battery can last up to 2 weeks time compared to 5 to 7 days of the Nickel Hydride.

However, there are people who are still lamenting of their batteries not lasting long. Others recommend that buying the Oral B Smart 4 400N CrossAction electric toothbrush is the one that comes with a Lithium-ion battery and others come with a Nickel.

Otherwise, the battery flashes red when needs charging, sparks green when it is charging and no flashes when it is fully charged.

You get a charging station that runs on 220 to 240 volts and a 2 pin plug than needs you to connect it on your shaving socket in the bathroom or alternatively buy a 2 to 3 pin adaptor. The station can hold up to 2 toothbrush heads at the time.

Oral B Smart 4 4000 vs. Oral B Pro 4000 vs. Oral B Smart 4 4500

The Oral B Smart 4 4000 is an improvement of the Oral B Pro 4000.

What differentiates the Smart 4 from pro 4000 is the Bluetooth connectivity. The Pro 4000 does not include Bluetooth technology.

Another difference is that while the old version, the Pro 4000 has 4 cleaning modes, the 4 4000 smart has only 3 modes, quite strange.

And what differentiates the Smart 4 4000 from the Smart 4 4500 is the travel case and the number of cleaning modes. The Oral-B Smart 4 4500N includes a travel case and 4 cleaning modes (daily clean, gum care, sensitive and whitening) compared to three of the 4 4000 modes (daily clean, sensitive and whitening). The Oral-B Smart 4 4000 lacks the gum care, mode specially made for cleaning gums.

Check the Oral-B Smart 4 4500N CrossAction Electric Toothbrush Rechargeable Powered By Braun, One Black Connected Handle, Three Modes Including Whitening and Sensitive, Two Toothbrush Heads, One Travel Case here.

Oral B 4000 review, For more, check our dedicated Oral B electric toothbrush 2019.

Review Date
Reviewed Item
Oral-B Smart 4 4000N CrossAction Electric Toothbrush Rechargeable Powered By Braun
Author Rating

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