The name of the sonic toothbrush is derived from the first sonic toothbrush, Sonicare. In fact, Sonicare is only a brand, and has nothing to do with Sonic. Generally, the sonic toothbrush is only at a vibration speed of 31,000 times/min or more. However, after the translation, I don’t know if it is misleading. Many customers misunderstand that all electric toothbrushes that make sounds when human ears can hear are sonic toothbrushes, or use the principle of sound waves to brush their teeth.
The real sonic toothbrush requires vibration frequencies up to over 50000 movements per minute
Hilton Children’s Sonic Electric Toothbrush
In fact, the frequency range of human hearing is about 20～20000Hz, and the speed of sonic toothbrush is 31000 times/min converted into a frequency of 31000/60/2≈258Hz (the reason for dividing by 2 is that the left and right brushing is a cycle, and the frequency is the unit time The number of cyclical changes within) is within the range of human ear’s auditory frequency; while the speed of an ordinary electric toothbrush (3,000~7,500 times/min) is converted to a frequency of 25～62.5Hz, which is also the human ear’s auditory frequency Within the scope, but can not be called a sonic toothbrush.
Sonic electric toothbrushes offer a secondary type of cleaning related to an effect called fluid dynamics. Because of the much higher rate of brush speed, sonic toothbrushes agitate the fluids in the mouth (water, saliva, and toothpaste), effectively turning them into cleaning agents that reach into crevices that the brush can’t access, like between teeth and below the gum line.
Post time: Jul-09-2021