Summer is here, in order to be beautiful, the girls began the body hair tug-of-war: shave shave shave! Plucking and plucking! However, it is really annoying to shave body hair every day, waxing is very painful, and there is a risk of allergy to depilatory creams, so many girls have turned their attention to laser hair removal. Is laser hair removal really as safe as advertised? Will it harm the skin? Will it affect sweating? There are no side effects? In fact, as long as you understand the principle of body hair and laser hair removal, these questions will be solved. Here we will learn about this knowledge, “with understanding” to remove hair! First of all, let’s first recognize the body’s hair hair cognition of human hair, can be divided into hard hair and cui-ui (cuì) hair, that is, hard hair and hair. 1, hard hair: coarse and hard, darker color, with medulla. Including long hair, such as hair, beard, armpit hair, chest hair, pubic hair, etc., the length is generally greater than 1cm; short hair, such as eyelashes, eyebrows, nose hair, ear hair, etc., the length is generally less than 1cm. 2, Cuiui Hair: fine and soft, lighter in color, no medulla, but also the more hair or sweat, mainly distributed in the face, neck, limbs and trunk. Hair cycle is generally divided into anagen (2~7 years, that is, the hair follicles live wild growth period), regression (2~4 weeks, the retirement of the hair follicles) and resting period (about 3 months, the hair follicles of the terminal stage). After the resting phase, the dead hair follicle is shed and another hair follicle is born to start a new growth cycle. Hair removal: Hair removal mainly targets hairs in the anagen phase. The purpose of hair removal is achieved by continuously removing the hairs in the anagen phase, leaving most of the hairs in the anagen and resting phases. What is the difference between laser hair removal and the simple and crude methods of hair removal such as shaving, plucking, waxing and depilatory creams? The principle of laser hair removal Laser hair removal is based on the principle of selective photothermodynamics, adjusted to a specific wavelength, energy of the laser through the epidermis irradiation of the hair follicle, so that the thermal effect of the hair follicle necrosis, to achieve permanent hair removal effect. Five factors affecting the effect of laser hair removal 1, wavelength We know that light has a wavelength, different substances on different wavelengths of light absorption efficiency is not the same, therefore, scientists to find a suitable range of wavelengths ( 600 ~ 1100 nm), so that the beam of laser light can penetrate into the depth of the hair follicle, and so that the melanin absorbs most of the laser energy, and then to achieve the destruction of hair follicle effect. The commonly used laser wavelengths on the market are 694nm~1200nm, which are both more strongly absorbed by melanin and have better penetrating power. Therefore, as long as you choose the right wavelength and operate properly, laser hair removal will not cause major damage to the skin! 2, energy density The higher the energy, the better the efficacy, but the stronger the pain. Therefore, the most suitable density is to not appear side effects and hair removal people can accept the pain as appropriate. On the contrary, in general, if there is no pain or no reaction of local skin during hair removal, the energy density may be too low. 3, the number of hair removal The number of hair removal is related to the effect of hair removal, the better the effect of hair removal, the lower the number of hair removal. Of course, the hair removal effect is related to a series of factors. 4, hair removal interval Theoretically, different parts of the hair growth cycle is not the same, laser hair removal interval time is not the same, the shorter the resting period, hair removal interval time can be relatively shortened. 5, skin type, hair condition, site The lighter the skin color, the darker and coarser the hair, the more obvious the effect of hair removal. Dark skin is suitable for Nd:YAG laser; lighter color or white hair, need to use photoelectricity combined technology. Underarm, hairline, jaw and neck and limbs hair removal effect is better, upper lip, and chest and abdomen effect is worse. Does laser hair removal affect sweating? The human body sweats mainly by small sweat glands, and laser hair removal is to sweep away the hair follicles, hair follicles and sweat glands are two separate and independent organizations. Hair grows out of the follicle, while the sweat gland is next to the follicle, the two are not the same thing. So, it doesn’t harm the sweat glands does not affect sweating! At this point, you are basically a connoisseur of laser hair removal! You can go to the hair removal with understanding!