The procedure was pain free and my teeth got a lot whiter. For the rest of the day my teeth were very sensitive and hurt quite a bit but all pain & discomfort was gone by the next day.
Thanks. I think it took less than an hour and a half total. They did some prep work (to protect the gum and lips) then applied the bleach. After that I just sat underneath a lamp for about an hour (with 2 breaks in between).