“Walking bleach,” or endodontic whitening, provides a whitening solution for the many patients with one or more non-vital teeth. Non-vital teeth often appear darker than the rest of a patient’s smile due to internal bleeding caused by trauma, the presence of necrotic debris, or pigmentation as a result of previously used endodontic treatment materials. Thus, unlike most whitening cases where discoloration is caused by external staining to vital teeth (usually due to smoking, eating, and/or drinking habits,) as the pre-fix “endo” suggests, endodontic whitening, or walking bleach, is used when discoloration comes from the inside out.
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