Are beauty devices really useful?

Girls all love beauty very much. In our lives, girls like to use various beauty tools. It is not just cosmetics and skin care products. Some so-called beauty devices that incorporate high technology fascinate them. Moreover, the price of any beauty instrument on the market is not very cheap, ranging from a few hundred to thousands or even tens of thousands. So the question is, are beauty devices really useful?

Where does the impression that sound waves can clean come from?

I vaguely have this concept.

In fact, sound waves can be used for cleaning. There is something called "sonic dust cleaner", which is used to clean the dust deposited in the boiler flue. The energy of the sound waves is transferred to the dust through the air, causing the dust to vibrate repeatedly, become loose, and then fall down by itself.

Does the sonic cleaning of a facial cleanser also have some effect? ​​That's not the case. Sonic cleaning takes time to accumulate, and secondly, it removes the settled dust. You want to use sonic waves on your face for more than ten seconds to clean such tiny pores, it is impossible, don't dream about it~

What is the difference between sound waves and ultrasound?

Another point is that many students often refer to sonic facial cleansers or sonic toothbrushes as ultrasonic. So what is the difference between sound waves and ultrasound waves?

Their essence is the same, just the frequency is different. The frequency of sound waves is between 20 and 20,000 Hz, for example, Clarisonic is 176 Hz. The frequency of ultrasound is 20000 Hz

The above frequency has exceeded the resolution range of our ears and cannot be heard at all.

Ultrasound also has a cleaning effect, no wonder everyone likes to use the word "sound wave" to make a fuss.

The small instrument that people use to wash glasses and jewelry is an ultrasonic cleaner. This instrument uses water as a medium and "washes" away stains through the special effect of ultrasound on water. That’s what it means. The specific principle is quite complicated. Students who are interested can look up “cavitation”.

So, the conclusion is:

The sonic waves of sonic facial cleansers are just a gimmick; in essence, they still rely on the physical friction of the brush head.