Nowadays, laser technology has made great progress in medical beauty. Scientists have successfully applied the principle of “selective photothermal effect” to hair removal by using laser technology. The specific wavelength laser passes through the epidermis and directly acts on the hair follicle. The melanin of the hair follicle and hair stem selectively absorbs light energy. The resulting thermal effect makes the hair follicle coagulate and necrosis, and the hair will no longer grow.
Hair removal methods
There are many hair removal methods, which can be roughly divided into two categories – non thermal power hair removal method and thermal power hair removal method. Non thermal dynamic hair removal methods include scraping, pulling, wax hair removal and the use of hair removal cream. These methods can only achieve temporary hair removal effect, and soon hair will regenerate. Thermodynamic depilation includes electroacupuncture depilation and laser depilation, which belongs to permanent depilation. Although electroacupuncture depilation can achieve permanent depilation effect, it is more painful when depilating, and it will also produce complications such as scar, which is not easy to be accepted by the public. In recent years, with the wide application of laser technology in the medical field, laser hair removal is being familiar and accepted by more and more people with its advantages of strong pertinence, remarkable curative effect, simple operation, fast speed and small trauma.
Hair removal with the most advanced laser machine
There are many lasers for hair removal, such as emerald laser, ruby laser, etc. To judge the effect of laser hair removal, on the one hand, it depends on the result (whether the hair is removed) and on the other hand, it depends on the process (pain, wound size, etc.). 755 nm alexandrite laser machine is the most advanced laser hair removal instrument in China, and the hair removal effect is very satisfactory.
The working principle of 755 nm laser machine is roughly the same as that of general laser machine. Its main advantage is that the laser machine is equipped with cooling device. The cooling device can spray non-toxic refrigerant on the skin surface tens of milliseconds before each laser pulse, which can not only protect the epidermis from burning, but also have a certain analgesic effect. When treated with 755 nm laser machine, there is only a slight burning sensation, the epidermis is is not damaged, and naturally there will be no scar. After treatment, you can take a bath, live and work as usual.
Treatment characteristics of laser hair removal:
◆ the scope of laser hair removal is very wide, and the hair of all parts of the body (such as lip hair, armpit hair, limb hair, etc.) can be treated.
◆ the principle of “selective photothermal effect” of laser determines that laser has strong effect on thicker and blacker hair follicles (more melanin) and good hair removal effect. The finer and softer the hair, the lighter the hair color, the worse the depilation effect. Because there is no melanin in hair follicle, laser treatment is ineffective.
◆ the 755 nm laser machine equipped with cooling device can play a good role in protecting the skin. There was no pain during treatment, no damage to the epidermis after treatment, and no worry of leaving scars.
◆ laser hair removal needs 3 ~ 5 times to be fully effective. Because the growth of hair goes through three stages: growth period, regression period and rest period. Melanin exists in hair follicles during growth, and laser can destroy hair follicles at this stage; There was less melanin in hair follicles in degenerative stage, and the damage effect of laser on hair follicles was weak; There is no melanin in the resting hair follicle, and the laser has no effect on it. The laser will only work on it when the resting hair follicle changes into a growing hair follicle.
◆ no preparation is required before laser treatment. Within two weeks after depilation, the treatment site should avoid ultraviolet radiation to avoid transient pigmentation.
◆ the interval between two depilations is about one month.
◆ the time required for laser hair removal depends on the treatment area. For example, the treatment of lip hair can be completed in 5 ~ 10 minutes, the treatment of axillary hair takes about 20 minutes, and the treatment of legs and multiple parts takes about an hour.
◆ the laser will not affect the function of sweat gland and sebaceous gland. Because laser only works on melanin, hair follicles contain a large amount of melanin. Laser with a specific wavelength acts on hair follicles, and its heat energy is absorbed by melanin in hair follicles, which makes hair follicles coagulate and necrosis, so as to achieve the effect of permanent hair removal. There is no melanin in sweat gland and sebaceous gland, and laser has no effect on it.
Hair removal trend – photon hair removal, specializing in fine hair
Photon hair removal is a new hair removal technique, which is fully known as intense pulse photon hair removal. The principle of photon hair removal is similar to that of laser. It also acts on melanin in hair follicles according to the “selective photothermal effect”, so as to destroy hair follicles and prevent hair growth. Because the pulse spectrum of photons is very wide, ranging from 695 ~ 1064 nm, it is especially suitable for removing hair with large area and different color depth. Even some soft and fine hair can be easily removed by photons, which makes up for the deficiency of laser hair removal treatment.