The walking bleach technique should be attempted first in all cases requiring intracoronal bleaching. The walking bleach technique involves the removal of all restorative material from the access cavity, and the pulp horns and other areas potentially containing pulp tissue are properly exposed and clean.

The walking bleach paste is made by mixing sodium perborate and an inert liquid, such as water, saline, or anesthetic solution, to a thick consistency.

Although a sodium perborate and 30% hydrogen peroxide mixture bleaches faster, in most cases long-term results are similar to those with sodium perborate and water, and therefore should not be used routinely.

The paste is used to pack the pulp chamber, followed by application of a thick well- sealed temporary filling (preferably IRM) directly against the paste and into the undercuts. The patient is recalled approximately two weeks later and if necessary the procedure of walking bleach is repeated several times.