Understanding Laser Hair Elimination Principles!

Laser hair elimination is based on the theory of selective photothermal action. Hair follicles and hair shafts are rich in melanin, and lasers can precisely and selectively target melanin for hair removal. After the melanin absorbs the energy of the laser, the temperature rises sharply, which causes the destruction of the surrounding hair follicle tissue and removes the hair.

In short: there is melanin in the hair follicle → melanin shrinks after absorbing light → hair falls off naturally

When the hair follicles are destroyed, natural hair does not grow.

But the problem comes again, how many times does laser hair removal principles take to get rid of hair?

Hair growth is divided into anagen, catagen, and telogen. During the growth phase, the hair matrix cells divide rapidly, and this period has the most melanin, so it is extremely sensitive to laser light; in the degenerative phase, the hair matrix degenerates and the dermal papilla atrophy; in the telogen phase, the hair follicles are separated from the dermal papilla, and the hair falls off. .

The relationship between the hair growth cycle and hair removal treatment: ①Because the laser has no obvious effect on the hair in the degenerative and telogen phase, the laser can only work after these hairs are transferred to the growth phase. Therefore, laser hair removal requires multiple treatments to achieve obvious effects. . ②If the proportion of hair in a certain part is small, the number of treatments should be increased. Conversely, the number of treatments can be reduced. ③Because different parts of the hair have different growth cycles, the interval between each treatment is also different. If the hair on the head has a relatively short rest period, the interval can be as short as 1 month; the rest period of the trunk and limbs is relatively long, so the treatment interval is about 1 to 2 months.

Here is the Q&A time:

Will sweating be affected after laser hair removal?

Since sweat glands and hair follicles are two independent tissues, and the wavelengths of the two absorbing lasers are different, laser hair removal will not affect sweating.

According to the theory of selective photothermal action, as long as the appropriate wavelength, pulse width and energy density are selected, the laser can accurately destroy the hair follicle without causing damage to the adjacent tissue. Studies have shown that the histological structure of sweat glands is not damaged after laser hair removal, and the clinical observation of patients’ sweat gland function is basically unaffected. Using advanced laser hair removal equipment, not only will not damage the skin, but also shrink pores, making the skin smoother and more delicate.

Will laser hair elimination affect other normal skin?

Laser hair removal is a very safe and effective method of hair removal. It is highly targeted and has no side effects on the human body. The skin of the human body is a relatively light-transmitting structure. In front of a powerful laser, the skin is simply a transparent cellophane, so the laser can penetrate the skin and reach the hair follicle very smoothly. Because the hair follicle has a lot of melanin, it can be absorbed preferentially. A large amount of laser energy is finally converted into heat energy, which increases the temperature of the hair follicle and achieves the purpose of destroying the function of the hair follicle. In this process, because the skin does not absorb laser energy relatively, or absorbs a small amount of laser energy, the skin itself will not have any damage.

Is laser hair eliminationpainful?

Answer: Slight pain, but the degree of pain varies from person to person. The degree of pain is mainly judged according to the skin color of the individual and the hardness and thickness of the hair. Generally, the darker the skin color, the thicker the hair, and the stronger the stabbing pain, but it is still within the tolerable range; the skin color is white and the hair is thinner, the lighter the pain. ! If you are sensitive to pain, you need to apply anesthesia before treatment, please communicate with the therapist first.

Can laser hair elimination be permanent?

A: Yes, it has been clinically proven for 30 years that laser hair removal is the only effective permanent hair removal. The laser penetrates the surface of the skin and reaches the hair follicle at the root of the hair, directly destroying the hair follicle, thereby making the hair lose its ability to regenerate. Since the process of endothermic necrosis of hair follicles is irreversible, laser hair removal can achieve permanent hair removal. Laser hair removal is currently the safest, fastest and most durable hair removal technology.

When is laser hair removal ?

A: It depends on the treatment area. The hair removal time is about 2 minutes for lip hair, about 5 minutes for armpit hair, about 20 minutes for calves, and about 15 minutes for arms.

How many times does laser hair elimination take?

Answer: As mentioned earlier, there are three periods of hair growth: growth phase, regression phase and stationary phase. Only when the hair follicle is in the growth phase will there be a large number of pigment particles in the hair follicle and can absorb a large amount of laser energy, so laser hair removal treatment It cannot be successful at one time, and usually requires multiple consecutive laser irradiations to achieve the ideal effect of permanent hair removal. Generally, after 3-6 treatments, the hair will not grow back, of course, very few people need more than 7 treatments.

Are there any side effects of laser hair removal ?

A: Laser hair removal is a relatively advanced permanent hair removal method at present. I personally tested it and found no side effects.

Laser hair elimination advice:
  1. Choose a regular laser hair removal agency! (please repeat it three times automatically) I think the captain went to a beauty salon for treatment. After 1 year of regular treatment, there are still a lot of hairs (because the equipment is not good), and there is still blood when shaving. At that time Really worried about contracting AIDS, crying. It was a waste of time and money. Later, I went to a regular plastic surgery and beauty hospital to solve the problem. I found that the price of the beauty salon is more expensive than the regular plastic surgery hospital. What a fool!
  2. Look at the treatment period! It is recommended to choose a hospital with a relatively long contract period. Now it is usually 1 to 2 years. The longer the contract period, the better, because it is true that some people will be treated for more than one year because they have no time and are not treated on time. In the future, people will ignore you, so it is recommended to find a contract for a long time.
  3. The instrument is very important! Just like what I did in the beauty salon at the beginning, the instrument was not up to standard, so I did it back and forth many times, but I still could not completely remove the hair. Later, when I went to the plastic surgery hospital, I used LEFIS from China and Feidun Freezing Laser from Israel, and now I have been out of treatment.
  4. Remember to use sunscreen after treatment, don’t go out to bask in the sun immediately, it is easy to lose color!
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