Science Behind The Working Of An Electric Toothbrush


Internal Core Of An Electric Toothbrush:

Science Behind The Working Of An Electric Toothbrush

Electric toothbrushes have been in use for a long time. Stats show that 131.43 million people in the US use battery-powered toothbrushes. You might be one of them. If not, even then, you are encouraged to read till the end. This will help you gain some extra input on the interesting mechanism we’re about to discuss.

“Knowledge speaks but wisdom listens” – Jimi Hendrix

In this article, we will dwell on the question of how an electric toothbrush works. We will also talk about the solution to buzzing sound, on charging.

Internal Core Of An Electric Toothbrush:

To understand the working of an electric toothbrush, you must know the core components that collectively form an electric brush. Below mentioned are the parts of an electric toothbrush:

  • Rechargeable battery
  • Electric motor
  • Cam and Gear unit
  • Circuit board (Mother board)
  • Charging coil
  • Metallic case
  • Metallic button (Power button)

The difference lies in their durability. A sneak peek into the online world of different forums show many positive reviews(Businesswire, Dentaly) of FOSOO’s electric toothbrushes. This shows that the electric brushes of FOSOO are, by far, the most effective in terms of performance and durability.

Working Of An Electric Toothbrush:

The working mechanism of battery-powered brushes has been simplified into two parts; cleaning action and charging action.

Cleaning Action:

  • On pressing the power button; the circuit will be completed and the motor will be powered.
  • The powered motor will start spinning.
  • If you carefully observe the brush head of an electric toothbrush you’ll notice that it vibrates back and forth. This oscillatory motion is due to the cam and crank as it converts the rotatory motion of the motor into vibratory motion.

Charging Action:

The wireless charging mechanism of electric brushes work on the principle of electromagnetic induction. The credit for this goes to Nikola Tesla; who invented the induction motor in the19th century. You might be thinking about the charging mechanism as complex; but it’s not, as we have simplified it below.

  • The charging base encloses a copper coil.
  • The electric toothbrush also has a copper coil, within.
  • When the charging base is connected to an electric power source, current flows through the coil, and the magnetic field is set up.
  • When the electric toothbrush is brought near the charging base; the copper coil within the electric brush is pulled towards the magnetic field. This allows the current to flow through it.
  • In other words, an electric current flowing through one coil can induce the current in another coil, if placed within its magnetic field (electromagnetic induction).

Electric Toothbrush Is Buzzing On Working or Charging: What To Do?

Buzzing noise can be very irritating. You might be someone who placed his electric toothbrush on charging and, all of a sudden, you heard an irritating buzz.

1.      Restart Your Electric Toothbrush:

Professionals are unable to explain the concept of how a device can sometimes work if restarted. This can be done by long-pressing the button and then pressing it again.

2.      Charging Near Another Unit:

A “buzz” can be heard if charging is done near another toothbrush unit placed nearby. This might occur because the induction phenomenon of one device interferes with another. It can also happen for other wireless devices.

3.      Problems Within The Motor:

One of the crucial parts of an electric brush’s motor is the actuator screw. For those of you who don’t know; it is responsible for the spinning action of the motor. A loose actuator screw can result in a buzzing sound when charging.

Please contact our staff( if this happens to you.

    4.      Problems Within The Electric Socket:

    A circuit breaker, if earthed, can result in a buzzing sound when the charging base is plugged in. 

    If the sound is amplified in such a case, then replace the charging socket and try another one.

    5.      What To Do If The Buzzing Persists?

    If you’ve tried all of the above and the buzz is still there, it’s time you buy a new electric toothbrush. But before doing so, you must contact our customer support and discuss your problem with them.


    There are multiple parts in an electric toothbrush that are crucial to its working. Working mechanisms involved in the cleaning and charging action have been simplified in the preceding sections. This simplified “Pandora box” can help you fix your toothbrush at home or identify the problem, if present.

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