I paid $750 (in the NYC area) to have this done---maybe 2 years ago. Things may have changed, but the product the dentist with me was NOT at all worth it. They told me that my teeth would stay that white, as long as I didn't smoke, drink wine, eat anything staining, stop brushing teeth, etc. Since I'm vegan (vegetarian), my food intake is limited to non-dyed foods, and I don't smoke or drink alcohol. So, I followed their instructions to a "T" (avoiding blueberries, beets, etc.), but my teeth seemed to remain that gorgeous glowing white for only a few days---I guess until the bleeching stuff wore off from the sun or something?
Anyway, even if you do want to try it and don't mind spending that kind of money for a one-time whitening, keep this in mind: Before they can infuse the bleech (--and they don't warn you about this--), they do something that somehow (I'm not a dentist, so I don't know the terms) opens the pores of your teeth. I never realized my teeth had pores (or whatever you would call small openings that go deeper into the tooth and eventually to the sensitive root), or that a chemical process could 'open' them. This is why a poster above was describing the awful tooth sensitivity after the procedure. I can't describe how weird that feelign was, except to say that if you ever got kicked or hit in the mouth in school sports or something, and you felt that quick shock-pain when your tooth or teeth were hit?... Well this gives you that feeling on _all_ your teeth _every_ time you breath in (and air rushes past/into those pores). I couldn't believe the dentist told me I might have "a little sensitivity" for a half-hour or so afterward. Like the poster above, it was _intense_ for me, and was still bad the day after. (It was also quite embarrassing to return to work after the noon-time dentist appointment, and be in [intentional/physically-reflexive] tears every time I opened my mouth to speak.
I hope people will post positive experiences if they have had them; maybe things have changed since I had mine done.
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