How Does An Electric Toothbrush Work?

what is the working principle of electric toothbrush？

The electric toothbrush contains a small motor that makes the brush head vibrate back and forth. The small motor is connected to a battery that can be recharged over and over again. When you brush your teeth, the electrical potential energy stored in the battery is converted into rotational kinetic energy, a process that actually reflects a technique we use a lot in our daily lives. The coils in a motor lie between the S and N poles of a small magnet, and a current flows through them, creating a magnetic field that repels one pole of the magnet and attracts the other, causing the coils to distort.

The coil is connected to a rod along the diameter of the coil, which rotates when the coil is twisted. By means of a clever switching device, the direct current generated by the battery can change direction every half cycle, so that the coil is constantly repelled by one pole of the stationary magnet and attracted by the other. Using an eccentric lever, the motor's rotational kinetic energy is converted into forward and backward motion so that the head of the electric toothbrush vibrates between your upper and lower teeth.

It can be seen that the working principle of Sonic Electric Toothbrush is equipped with a small motor, which can make the brush head vibrate back and forth. Before using the electric toothbrush, install it correctly, adjust the softness of the bristles and insert proper amount of toothpaste.