to also understand hair growth cycles. All hairs on your body have a cycle of growing (anagen), resting (catagen), shedding (telogen). When you pull a hair out from its root, it takes 4 weeks for a new hair to replace the old one — so 4 weeks from anagen to telogen.
growth cycle to have them all coming in at the same time, but by regulating your hair removal (in this case, threading) and having regular 4 week appointments, you will help those brow hairs come in as close to the same time as possible, giving you a nice, clean brow.
upper lip, chin area) and they complain that their hair grew back within days, this just means you haven't pulled those hairs from the root; they've been broken and the root is still in the skin.