After performing teeth whitening for more than twenty years-whitening is as much art as it is science. There are many ways to whiten your teeth. The best method for you may be different than the best method for someone else.
KoR whitening is good because it has a very low sensitivity rate. It can also get whitening results in cases that typically do not respond well to other types (like Zoom Whitening).
The key is to meet with an experienced cosmetic dentist. Discuss what results you are aiming for, mention how comfortable or sensitive your teeth are, discuss what home care you are willing to do and he can help you select the right type of whitening for you.
I see MANY people less than satisfied with all sorts of whitening results from other offices. The biggest reason is that they typically have one main treatment that they try to make fit for everyone. There is no one size fits all success in teeth whitening. You need to visit with the cosmetic dentist and ask your concerns about what you have read on line.
There is no reason why you shouldn't be able to get nice whitening results in a manner that is most comfortable for you.