In threading, a thin (cotton or polyester) thread is doubled, then twisted. It is then rolled over areas of unwanted hair, plucking the hair at the follicle level. Unlike tweezing, where single hairs are pulled out one at a time, this process can remove short lines of hair.
It allows for a more defined and precise shape and can create better definition for eyebrows. It is also used as a method of removing unwanted hair on the entire face and upper lip area. It is not a good method for removing hair on arms or legs, as the hair in those regions is typically quite coarse and there is too much to remove.
Is it painful?
Depending on the therapist/your tolerance/the time of the month. It can feels like tweezing multiple hairs at at once. Obviously try not to flinch during it, or you could end up with unwanted bald patches.
Do I need to do anything?
you'll be asked to pull your eyelids in opposing directions, so the skin is tighten to make it easier for the therapist to work on. Always ask and they'll explain!
How about makeup?
Take off your makeup (for the above reason) or you'll probably smudge it everywhere.
Are there any side effect?
random sneezing and eye watering – they might literally stream (not from the pain, but the sensitivity). You will temporarily experience rosy skin (some suffer worse than others), so you might not want to go straight out on a date afterwards, but it'll last an hour, max.
Can I apply my makeup immediately after?
you'll be told not to apply concealer/foundation afterwards and don't ignore the advice; makeup could clog the pores left open by the hair removal and cause spots
Your freshly threaded brows will be easier to fill in yourself, making the morning makeup routine quicker. There's no need to pluck between appointments, but when you feel the need to (after 5-6 weeks), save them up for a week and re-book.