Current is brought to the hair follicle by means of a thin needle. The heat that is generated destroys the hair follicle so that no new hair can grow out. If the hair is in the resting or expelling phase, it is no longer attached to the hair follicle and a new hair may already be formed in the hair follicle deeper in the skin. Unfortunately, it is not possible to see from the outside in which phase the hairs are and several treatments will be needed to treat all hairs.