Laser hair removal works by sending a beam of laser light to a group of hair follicles with enough power to destroy the root but not enough to harm the surrounding skin. The technologies are designed to cause selective heating of hair follicles but are safe for surrounding tissues. This process is called selective photothermolysis (photo means light and thermolysis means to destroy with heat). It is selective as it targets hair and not skin.
Laser hair removal is not electrolysis. Electrolysis works by directing an electric current into each individual hair follicle which is painful and time consuming. Laser can target a large amount of hairs in one go virtually pain free.
It is not IPL. IPL is designed to treat conditions such as acne, Rosacea, aging and sun damaged skin. Although it has been found to assist in hair reduction, IPL emits a scattered, unfocussed light, where as Laser is targeted focused beam which is why it is better at hair removal. The LightSheer laser that we use has a focused laser beam specifically optimised to target just the hair follicle. The hair follicle absorbs the laser energy and destroys the root and the hair cannot re-grow.
Hairs must be in the correct growing stage (anagen) when it has an active blood supply. Different hair follicles will be in different hair growth stages at any one time. These hair growth cycles can vary between a few months and a year and this is why it requires several sessions to ensure catching the hair in the anagen stage.