E-SWIN E-Flash 4C Manual De Instrucciones página 56

6.1 How does light manage to remove hair?
uses pulse light technology that enables slower hair regrowth and reduces
hairiness gradually as and when hair removal sessions happen.
Photo- epilation is based on the theory of selective photothermolysis using optical energy
to stop hair growth. In order to achieve such thermal effect, the hair root must absorb
photo energy in a selective way and convert it into heat. This selection occurs when the
optical energy issued is mainly absorbed by the pigment of the hair bulb, responsible
for the absorption of light, which generates the heat that will stop hair growth. Also, the
more melanin the hair contains (i.e. the darker the hair is), the more light it can absorb
and thus, photo- epilation becomes effective.
6.2 What is the impact of the hair growth cycle on photo-epilation?
Every hair in our body goes through three phases of growth: the anagen phase, the
catagen phase and the telogen phase. These three phases play an important role in the
photo-epilation process. The anagen phase is the growth phase of the hair, while the
catagen and telogen phases are both resting phases. The time it takes for a hair to get
through its entire hair cycle varies from person to person, and depends on the region of
the body where it is located. However, the average is between 18 and 24 months.
The majority of hair follicles found themselves
in one of these two resting phases at one
point. Therefore, the hair removal device
will have no effect on the hairs
when they are in these resting phases.
However, it will act on hairs that are in the
anagen phase
56
anagen
18 to 24
months
telogen
catagen