Teeth Whitening Treatment in NYC can range from $125 for “Go Trays” a prepackaged home whitening system to $750 for “The Korr” whitening system that involves custom-fitted trays made from a dental scan and made form a 3D model. The system includes refrigerated whitening gel that the patient wears at night for 2 weeks followed by an in-office whitening system that takes about an hour. A third choice can be one of the in-office whitening procedures like “ Boost” that costs about $450. Ask your dentist which is the best choice for you.