electric current is applied with a very fine probe to destroy the hair root..... I have irregular periods due to which there wz much unwanted hairs.. I went through this treatment for about year (MONTHLY 2 TIMEZ) for upperlip, ( on chin, and sidelockz-- for 1.5 yr).. nw itz been 1 yr, I hardly find 1 or 2 hairz... as ALLANA give permanent hair removal guarantee, we can go their n treat fr dat 1 or 2 grown hair.. BT ITZ D BEST TREATMENT.... bt the place whr i took treatment has become little dark compared to rest of my face... itz been 1 yr.. no1 can notice it.. bt if i see clearly i can notice.. BT I AM HAPPY WITH MY HAIR FREE SKIN... :)