I just waltzed right into offices, usually the secretaries can handle it and just ask if they actually do a number of extractions before hand so later on you don't come up empty handed. Some are picky and will ask you to buy listerine to store the teeth in. Then you question them by asking "well doesn't listerine discolor the teeth?"...where they snap back at you with some weird answer and you buy the listerine anyways...only hoping to bleach the teeth back to their natural color. Good luck!