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Hair Removal
Laser hair removal is a non-surgical, non-invasive method of removing unwanted hair.
A laser beam travels through the skin and is attracted to the pigment in the hair.
The energy then flows to the hair follicle growth cells to inhibit further hair growth. The hair removal by laser depends on the principle of selective photothermolysis which is the gradual heating of hair.
When the right wavelength of the laser is applied to the desired treatment area the melanin in the hair absorbs the laser which converted into thermal energy.
The increases of thermal energy cause the destruction of hair follicles, while the surrounding skin is undamaged. Some follicles will only be damaged or may regrow, so numerous treatments are required to reduce or eliminate unwanted hair effectively for a persistent result.
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Treatment
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Hair Anatomy : Anagen – Catagen – Telogen – Early Anagen
Hair has a growing cycle as anagen (growth phase), catagen (transitional phase) and Telogen (Resting Phase). During the hair removal treatment, thermal energy is delivered to the hair follicle and it destroys the hair follicle.
At the time, the hair on anagen is removed effectively but the hair on catagen and telogen isn’t removed because they do not absorb the laser on the epidermis. So these hairs should be removed when they become anagen by additional treatment.
Therefore, in order to remove all hair, we need hair removal treatment based on the hair cycle repeatedly. It is normally 4 to 6 times of treatment based on skin type and hair type. For thin hair or bright hair which has less melanin, more treatments sessions at shorter pulse duration ( 3-5msec ) can be required