Cervical Resorption Associated with Bleaching

30% hydrogen peroxide treatment may cause alteration in the chemical structure of the dentin and cementum making them more susceptible to degradation.

From the results of this study, heat plus 30% H202 was the combination associated with resorption. Etching alone is not responsible for the resorptive process

These results caution against indiscriminate use of bleaching with hydrogen peroxide, and emphasize the importance of preventive measures and postoperative follow-up of bleached pulpless teeth.

Oxygen peroxide can injure the periodontal tissue and cause resorption and ankylosis by allowing bacteria to penetrate dentinal tubules
If this procedure is used, the orifice of the root canal should be covered, e.g. with a zinc-oxide eugenol cement, in order to prevent oxygen peroxide from reaching the root dentin.

In cases of traumatic pulp devitalization, internal bleaching may cause cervical resorption