Ultrasonic wave propagating in liquid can clean dirt on the surface of objects, and its principle can be explained by "cavitation" phenomenon: when the sound wave pressure of ultrasonic vibration propagating in liquid reaches one atmosphere, its power density is 0.35w/cm? At this time, the peak pressure of ultrasonic wave can reach vacuum or negative pressure, but there is actually no negative pressure, so a great force is generated in the liquid to crack the liquid molecules into cavities. This cavity is very close to vacuum. When the ultrasonic pressure is reversed to the maximum, it will rupture, and the strong impact force generated by the rupture will knock down the dirt on the surface of the object. This shock wave phenomenon caused by the rupture of countless tiny cavitation bubbles is called "cavitation" phenomenon. This great discovery first benefits human health, such as the application of ultrasonic tooth cleaning, ultrasonic jewelry cleaning and ultrasonic cleaning in industrial disinfection ... The ultrasonic toothbrush transmits ultrasonic energy to the surface of the brush head through the transducer, and uses toothpaste and water as the medium to make it produce supercritical "cavitation" phenomenon, which makes the stains disintegrate and loosen, and then the stains after ultrasonic disintegration are easily washed away through 96 million mechanical vibrations per minute. High-energy "cavitation" water molecules generated by ultrasound can not only disintegrate stubborn stains, but also directly act on insoluble Staphylococcus aureus, cutting off the combination between bacteria and blocking the formation of dental plaque; Ultrasound can also effectively loosen the combination of bacterial surface and tartar and other stains, making it easy to fall off; Stains hidden in teeth and gums can also be thoroughly cleaned by high-frequency and high-energy water molecules. Ultrasonic waves acting on teeth and gums can effectively and permanently remove dental stains such as tartar and residue, and at the same time promote blood circulation of gums. After use, you will obviously feel tight gums. If you insist on regular use, you can also reduce and eliminate gingival bleeding.