needle electrolysis is the only thing guaranteed to kill the follicle
as the probe removes the hair variable as with laser you are relying on the pigment (black things absorb heat better than cold things) that said a needle probe (they are blunt on the end) slides down beside the hair and zaps the hair root blub in one hit done!
Various methods are available
Galvanic - bit olfd that now it basically means you hold a ground and a circuit is created through your body this creates a chemical reaction called lye in the bulnb and burns it out sounds worse than it is. Thats the original method first develop what about 100 years ago now.
Themal - thermolysis - this is where the needle tip gets hot and cooks it,
Blend a mixture of the two above - the heat speeds up the chemical reaction, supposedly gentler on top lips.
and the best which is FLASH thermolysis - flash capable machines are a bit pricer so a salon would have to invest like 2 grand plus for one I bought one about 6 years ago imported from the USA NY to be exact. Great piece of kit. Min is the Apilus last years model of this one so I can vouch for flash its the same as laser as in fast but through the end of a needle.
http://hofbeauty.co.uk/Salon_Equipment/ ... Multiplex/
here are some top tips i wrote
http://www.transgenderzone.com/library/ ... ext/44.htm