Cavity Preparation :-
● No cavity outline, no particular shape
● Outline is determined by caries margin
● Anterior prep ー give beveling is must; retention
● Posterior prepー no beveling at cavo surface angle, 90 degree is okay – Because it can't take masticatory load – might fracture ∴ causes microleakage would happen

BASE UNDER COMPOSITE

Preferred
 Ca(OH)2 or GIC or any modifications – RMGI – best
 Zn Phosphate
 Zn polycarboxylate

Contra indicated
● ZnOE
● Varnish
● Hydrogen peroxide [that's why wait 1 week after intra-coronal bleach (bleaching agents)

Q. Dentist provided bleaching which also known as (home bleaching) (night guard Vita Bleaching) contain : 5 - 22 % carbamide peroxide.

Q. After bleaching a tooth, we want to restore the tooth with composite resin, we don’t want to compromise the bonding, and we wait for: 1-2 Weeks.