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Which brand of laser hair removal device is better?
September 12, 2021

The purpose of writing this article is because many beauty salons and clinics want to choose a suitable hair removal device, but now there are many advertisements for laser hair removal devices, and there is no way to choose the most suitable hair removal device. So LEFIS tells the laser hair removal device how to choose.

This article is divided into two parts: the principle of hair removal instrument, the selection method of hair removal instrument catalog:

The principle of hair removal device

How to choose a hair removal device

1. The principle of hair removal device

Before understanding the principle of the hair removal device, we need to understand why many previous methods of hair removal cannot completely remove hair. As shown in the picture, this is a side view of the normal hair follicle structure growing hair. If the hair needs to grow normally, it is necessary to ensure that the hair maintains a normal physiological structure. In this process, the dermal papilla plays an important role in nutrient transmission. If you want to change the problem of rapid hair growth, from the root, it is necessary to destroy the dermal papilla. structure.

And this is the crux of the problem, the traditional way of hair removal is completely unable to cause any damage to the dermal papilla. The principle of the hair removal device is that: the energy emitted by the device can be converted into heat energy, and then reaches the pores through the surface of our skin, and directly acts on the dermal papilla on our hair follicles, destroying hair growth through the thermal coagulation of the hair follicle tissue. Hair papillae, which play an important role in hair removal, can be safely and effectively removed from the root.

And this process is irreversible, so there is no need to worry about the vigorous growth of the hair after hair removal. Generally, after one or several systematic and thorough hair removal, the hair will not grow vigorously again, and a relatively long-lasting effect can be achieved. Hair removal.

2. The purchase method of hair removal device

The selection of a hair removal device is not a very simple matter. When choosing, you need to consider two needs at the same time. On the one hand, it must meet the safety requirements, and on the other hand, it needs to be highly functional.

Safety is the most important thing to consider whether the hair removal device meets the national standards and whether it has the qualification certification of the relevant departments. Generally speaking, the quality of the products with the qualification certification is completely passed.

In terms of functionality, there are many things to consider. In refinement, consider the effect of ice, use mode, gear subdivision, auxiliary functions, and whether there are other requirements for use.

The effect of ice feeling is one of the important factors that determine the experience of using the hair removal device. A good ice feeling will make the use of the hair removal device even better. It is recommended to use the hair removal device with ice feeling experience with caution.

The usage mode does not need to be too much. It mainly needs to cover different functions, such as hair removal, whitening, skin rejuvenation, etc. Different functions need to be differentiated to a certain extent.

The most important point of gear subdivision is that it can cover different functions. The minimum gear should be more than three gears. Some people are relatively sensitive, so they need a depilator with more gears to easily adjust the gear that suits them.

Auxiliary functions are other functions that help with hair removal or whitening.

Whether there are other needs for use refers to the special needs of individuals, and some people have more detailed needs for hair removal functions.

Different skin tones, some people have fair skin, and some people have relatively darker skin. For people with very fair skin, you can choose products with a lower band, which is safer than those with darker skin. For people with dark skin, try not to choose short-wavelength photoelectric hair removal devices, because the light energy of the short-wavelength part is high, which is easily absorbed by dark skin, which can only damage the skin and is difficult to achieve the purpose of hair removal.

The selection of energy density should be comprehensively evaluated according to factors such as hair follicle depth, skin color, skin thickness, and skin sensitivity. Generally, the darker, thinner and more sensitive the skin, the lower the energy density. It is best to use a lower energy density at the beginning of use. As the number of uses increases, you can appropriately increase the energy by 1-2 J/cm2 according to your own tolerance. Generally, the hair removal device will have multiple gears.

(The concept of thermal relaxation time should be explained first. Thermal relaxation time refers to the time required for the heat acting on the target tissue to diffuse to the surroundings (diffusion can be understood as diffusion), when the temperature is reduced to 50%.)

The pulse width is the time that the pulse acts on the tissue. The pulse width needs to be selected according to the thermal relaxation time of the target tissue. In principle, it is less than or equal to the thermal relaxation time of the target tissue to ensure that the surrounding tissue is not damaged. The diameter of the hair follicle is about 200-300μm, and the thermal relaxation time is 40-100ms. According to the theory of selective photothermal action, the pulse width of the hair removal laser should be greater than the thermal relaxation time of the epidermis (0-10ms) and less than the thermal relaxation time of the hair follicle. .

Pulse delay refers to the interval time between pulses when the pulse acts on the tissue. The purpose is to prevent the energy from accumulating too much in the tissue in a short period of time, causing epidermal damage, which is equivalent to letting the hair consume this part of the energy.

The thermal relaxation time of the skin with a thickness of 100 μm is about 10 ms, and the heat dissipation of the skin is beneficial when the pulse delay is greater than 10 ms. The darker the skin, the longer the pulse delay should be.

Whether it is a laser hair removal device or an intense pulsed light hair removal device, the longer the wavelength, the higher the safety. 808nm laser is currently recognized as the ideal wavelength for laser hair removal; for intense pulsed light hair removal devices (photon hair removal devices), the optimal wavelength range is 650-1200nm; if it is a dark-skinned person, LEFIS recommends using a wavelength range of 700-1200nm Otherwise, dark skin absorbs a lot of heat and will damage the skin; while people with fair skin can use a 650-1200nm hair removal device, but you must be cautious when using it, and you must start from the lowest gear to experience and adjust.

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