How does “Pain Free” Laser Hair Removal Work?
when strong light is shone on the skin, the energy in this light is absorbed by the components in the skin (e.g. water and melanin). how much light is absorbed by each component depends upon the colour of the light as each component reacts differently.
For laser hair removal, the light is tuned to a colour that is absorbed strongly by the melanin in the hair. this causes the hair in the active hair follicles to heat faster than the surrounding tissue which causes the hair follicle to be destroyed. skin surface cooling also enables higher energy to be safely used, which further improves the effectiveness of the treatment.
Lighter skins with dark hairs respond well to laser treatment. the introduction of skin cooling has improved hair removal in darker skins and greatly decreased the risk of pigmentation changes that could occur with the older uncooled lasers.
We also use SHR or a modified form of SHR which is basically the delivery of a series of smaller pulses while the head is in continuous movement over the skin in order to generally heat an area of skin that contains hairs. When this is done the hairs absorb the energy more than the surrounding tissue causing them to heat more. In addition the head cooling is constantly cooling the epidermis which protects it and in particular protects the pain sensors at the base of the epidermis.
Hair Growth occurs in 4 stages: early hair growth -early anagen, active hair growth – anagen, regression – catagen, resting not growing – telogen.
Laser energy is absorbed by the melanin in the growing hair (anagen phase), one treatment will typically only remove 20 to 25% of the total available hairs as the dormant hair follicles do not contain sufficient melanin and will therefore not be affected by the laser.