A Neither hydrogen peroxide nor carbamide peroxide are able to penetrate into the pulp unless developmental or acquired cracks in the tooth are present.
B Bleaching lights and lasers force hydrogen peroxide molecules deeply into tooth structure and into the pulp, resulting in sensitivity; whereas, when lights and lasers are not utilized, hydrogen peroxide molecules do not enter the pulp.
C Bleaching material [hydrogen peroxide] always penetrates through intact enamel and dentin into the pulp in 5 to 15 minutes.
Indirect Restorative Temporization and Cementation of Porcelain Veneers: Predictable Workflow for Clinical Success
