How effective are they? Consulting a senior industry expert on this issue, the expert explained that at present, there are two main materials for face-lifting masks, one is plastic, which can prevent slipping, because you may sweat when using the mask, and the mask made of general materials may slip off due to the pressure of the mask itself, so the material is more expensive, and the other is similar to cloth, such as Lycra cotton, which mainly has two working principles. One is the so-called "changing face shape through muscle memory principle", and the other is promoting facial perspiration. Because the mask is similar to wearing tights on the face, the air permeability is not good, and Wuhan ultrasound removes bags under the eyes, which makes it easier to sweat. When introducing the principle of muscle memory, experts told us a bad habit of ancient women in China: foot binding, binding when a girl was a few years old, changing bandages regularly and applying medicine, which finally resulted in the so-called "three-inch golden lotus". Many people think that girls' feet don't continue to grow. In fact, it is the long-term binding that causes the distortion of the bones, and the arch of the foot has not become smaller, but has become a deformed state of bending. Here, the ultrasonic slimming and face-lifting mask causes muscle displacement through the pressure on facial bones and muscles, which is not only unscientific, but even dangerous. Moreover, many netizens on the Internet have suggested that the face shape is different after using the face-lifting mask. In fact, this is easy to predict. Experts say that many face-lifting masks only provide several sizes and models such as X/M/L, and there is no more diversified mask that can be adjusted for different face types. In this case, the stress on some specific structures of hands with different faces is uneven. For example, some people don't improve much after using the same mask because there is no particularly prominent structure on their faces, but some girls have high cheekbones or long chins. We know that many people with neck or limb injuries will use splints, similar to masks. If the fracture site is not reshaped, it is easy to cause secondary injury, and at the same time, the joint of bone will cut the nervous system. From the principle of action, facial mask is not only a beauty tool, but also a medical means. Experts said that in the case of no exercise, sweat evaporation is mainly related to two factors, one is the contact area between skin and air, and the other is the flow rate of air. Because the mask covers most of the face, neither can be achieved. Sweat can't evaporate, forming sweat deposits, which makes users feel sweaty, but in fact, the amount of sweat on their faces has not increased, but because sweat can't be removed, double eyelids give users an illusion of sweating more. In fact, people sweat even if they don't exercise, which is why people who don't move during sleep will be thirsty the next morning. From this point of view, there is no practical basis for the mask to increase sweating to lose face. At the same time, experts say that sweating is thin because the process of sweating is equivalent to the process of fat dehydration, and the fat volume will be thin if it is reduced. In other words, the role of the face-lifting mask here is to reduce the amount of fat. But the reason why the face is fat is not only the fat factor, but also the muscle and bone factors. We know that sweating can't cause the fundamental changes of the above two. Furthermore, experts say that even if the mask can really increase the amount of perspiration and reduce the volume of fat, experts tell us that if it only causes fat dehydration, it will be replenished immediately after drinking a little water, which is easy to fail.