A laser produces a focused beam of highly concentrated light that is then absorbed by the dark pigment or melanin in the hair surrounding the hair follicle. The pigment in the follicle absorbs the laser energy and converts in into heat, which selectively damages and disables the hair follicle. The laser used in laser hair removal is pulsed for only a fraction of a second. The duration is determined in order to be effective on the hair follicle while leaving no damage to the surrounding skin. Some of the hair is shed immediately after laser hair removal treatment and the rest is shed over the next 2 to 3 weeks.
All hair grows in cycles that consist of 3 stages: The Anagen phase (active growth), Catagen phase (dormant growth) or Telogen phase (fall-out stage). Hair can only be permanently destroyed in the Anagen (active) phase when the hair follicle has an abundance of colour and is being fed by blood vessels. The heat generated from the laser light seals off the blood vessels to these active hairs. 50- 80 % of hairs are in the active growth phase at one time.
Typically 25-35% of these hairs contain enough pigment to be permanently reduced. Hairs that survive laser hair removal treatment will come back, usually weaker and finer in texture.
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