Tooth whitening is a well-established procedure in cosmetic dentistry. Hydrogen Peroxide, the active agent in Zoom!, has also been safely used for many years in the treatment of gums and other oral soft tissue.
The whitening process is effective on most discolored teeth. Darker stains, such as those caused by antibiotics, are more difficult to whiten. The degree of whiteness will vary from patient to patient, depending on the structure of the teeth.