I have had some dental work − will this affect the results?
The whitening process will whiten natural teeth only. Therefore, you should be careful about how light you wish to go. Crowns can be whitened to the point that they were first put in, but no lighter.
How long will the treatment last?
If you take care of your teeth and use the maintenance kit that we sell, then you should keep them as white as when you first had the treatment. Without maintenance, between 1 to 3 years.