What Causes the Bright White Spots on Teeth

When teeth are whitened, you can have white spots appear from dehydration of the teeth during the process.  The whitening did not cause the white spots.  They were there before but not as visible.  With some whitening processes, the whole spots can get better by continuing the whitening process until it blends in more.  There is also a great in office process to remove the spots that do not blend.  It is called Icon.

The white spots on your teeth were likely present before starting the Zoom treatment. Before you start any whitening treatment, you should be evaluated to determine if you are a good candidate. By that, I mean that if you have any white spots, other enamel defects, any restorative work like crowns, fillings, or veneers, you may not be a good candidate. White spots on the teeth typically are a result of hypocalcified areas of enamel that occurred while the tooth was formed. These should be addressed prior to any whitening treatment, as they can become more noticeable after any whitening done.
One way that we address these spots is by a treatment called "MI Paste." MI paste can be used at home and in the dental office (with application of acid etch material) to help remineralize these areas and make them less noticeable. One added benefit of MI paste treatment prior to whitening is that it can greatly reduce sensitivity that occurs as a result of whitening. 
If you have these white spots after whitening that have now become more noticable, don't worry, they will eventually rehydrate and over time will return back to their original state (similar to what was present before the whitening).

These White spots were there prior to your whitening treatment, this is called decalcification of the enamel. The good news is the spots should be temporary. These spots should subside after a week or so. IF these spots are very bothersome you can contact the dentist to see what could possible be done.