There are two kinds of waveforms that common ultrasound devices provide. One is continuous waveform and the other, pulses. The difference between the two is that the pulse waveform, unlike the continuous one having heat efficacy, produces more powerful output suddenly in every circle. It is better for us to treat certain abnormalities. Hence, we use it on the field of therapy rather than the others. On the other hand, heat helps beautification so much that we prefer the continuous waveform.

• The rate of ultrasound
  The rate of ultrasound means the numbers of vibration occurred in a second. Hertz is the unit of measurement. 1000 wave circles occurring in one second means 1000Hz, 10000 wave circles, 10000Hz. As to ultrasound, over 20000Hz, it is not to be heard by human beings. At present, the ultrasound devices for both medicine and beauty are ranged from 1MHz to 5MHz or so.
• The wave property of ultrasound
  Now we understand that ultrasound is used in wide range. Besides, the feature of the wave itself plays an important role too. When the waves contact with matters, they would reflex different types of waveforms back. Therefore, dense waves like the ones produced by ultrasound would supply more delicate readouts. We take the advantage to distinguish the baby's sex, detect shoals of fishes, etc.
  These foundations mentioned above bring us three best efficacy of ultrasound that we will explain later. So far we recognize that not only the tiny bubbles remove away tiny dirt, the heat also accelerates the metabolism and blood circulation. It is applied as a new way to solve healthy troubles in modern days.
  One who experienced ultrasound may feel nothing but a little warm. Nevertheless, we can not neglect the long-time stimulation, for it causes the dermis tissue fatigued. Generally speaking, the maximum time is suggested not over 15 minutes. On the body, 10-15 minutes is suitable, on face, about 10. As to the guys over weight, prolonging few minutes would be fine. The time between two treatments is better over than 5 hours.
• The transmission of ultrasound
  Ultrasound can not transmit in the air. If the treatment head does not completely contact with the skin, the result would not meet your expectation. Researches display, the transmission proportion of ultrasound in the air is 0, about 50% in general water, 60% in distilled water, near 70% in glue matter, and above 70% in special gel. Besides, another efficacy of ultrasound is to promote the skin absorbing outside matters, no matter nutrition or dirt. Hence, the transmission is worthy to be noticed. Except cleaning your skin before using ultrasound device, we also suggested you use special gels or creams (they must be certified by hygiene organization) in case side effects.

3. The Efficacy of Ultrasound

Ultrasound has been used on the field of medicine, while it began on beautification only 15 years ago. Surprisingly, its three wonderful efficacy bring the ones who care about beauty a brand new world.

• Highly speed vibration ( machinery affect )
  The first efficacy of ultrasound is the highly speed vibration. Except in vacuity, same frequency of ultrasound would display various waveforms via different transmissions. Their action on the tissue is just like massage. We usually call this machinery affect as micro-massage. All other efficacy is extended from this one, for example, the heat efficacy and the bubbling action.
  The ultrasound applied in therapy is usually ranged from 1MHz to 1000MHz. Even the least vibration of 1MHz would be as keen as a sharp knife to cut off steels, if we reinforce its amplitude. However, the output of the ultrasound used in treating people must be decreased substantially. The wave produced for therapy and beautification is only few micrometers high. One would feel nothing but a little warm. It is better for our tender textures. Appropriate micro-massage plays a modulating role to our physiological system.
• The heat efficacy
  The heat is produced by vigorous friction of the modules in speed vibration. It is basically important to human body. To healthy cells, heat supplies energy and speeds metabolism, while to unhealthy ones such as cancer cells, heat weakens them and has them killed easily. Cancer cells can not survive at 43  and the lymphatic system works well at this temperature. That is why we usually kill cancer cells by heat therapy. However, for protecting healthy cells, almost all medical and beauty ultrasonic devices equipped the maximum output temperature and the timer setting for auto switch-off. The design is to rejuvenate our healthy cells and hurt no body tissues.
  According to the researches, massaging with 1MHz of vibration for ten minutes, the temperature of the skin texture 4-5cm deep into the surface would go up 0.5-1 degree centigrade, and with 1W/cm² of continuous ultrasound, 0.007 degree centigrade up every second. What does the heat do? It is not difficult to consider that heat helps dissolve the fat, that heat accelerates the blood circulation, and also that heat promotes sweat drainage. All these are immediately concerned to our health.
• The cavitation
  Stirring the water in a fish jar with a chopstick, we supply oxygen to the fish. The speeder we stir, the more bubbles we have. Now just image how many bubbles would be produced by one million stirs per second. That's right, countless and invisible. But, each bubble still does its best to do what a bubble should do. They wrap all oil, stain them up tightly, and remove them away even from the pores of the face. You do not have to worry about the composition of the facial cleansers again, or, if your face is cleaned well or not. Ultrasound is deemed to take the place of soap.
  No doubt, skin cleaning is the most important thing, especially for the one whose skin is oily. Most of people have tried and tried to find a perfect facial cleanser but seem to get no reward. Now, the cleaning method has to be changed to make a breakthrough. All we have to do is do a simple cleaning. As to the oozed oil, bacteria, etc. just leave to the ultrasound instead of variety of soaps.