YES! You could have Zoom whitening the same day your braces are removed. If you are getting ready for a special event (for example, a wedding or a graduation) then sometimes timing is essential.
But, that may not be the most comfortable way to have it done. Your teeth will be sensitive after the braces are off and they may become more sensitive from wearing a retainer. In addition, some people have a hard time keeping their gums in optimal health while the braces are on, so you could even have some gum inflammation.
To be the most comfortable I'd do it this way:
Start using a high concentration Fluoride gel (such as Fluoridex or Gel Kam) at home every day.
Have your teeth cleaned as soon as possible once your braces are off. Have Fluoride varnish applied by the hygienist after your cleaning.
Get used to your retainer for about 30 days.
Then go have your Zoom teeth whitening. I think you'll be much more comfortable!
Thank you, Scott Greenhalgh, DDS