A very fine filament is inserted in the hair follicle opening and guided to the bottom of the hair follicle where the papilla is located. Once in position, a small amount of current is applied. This action cauterizes the papilla and makes it permanently unable to regenerate hair.
Timing is everything. In order for the hair to be permanently removed, it must be treated while the hair is still attached to the dermal papilla. This occurs in the anagen stage of the hair growth cycle.