Leaking Restorations Should Be Replaced Before the Bleaching Process Is

Leaking restorations should be replaced before the bleaching process is started, to:

A) assure a correct shade match
B) be certain that restorative needs are treated before esthetic needs
C) prevent excessive penetration of bleach through dentinal tubules that might irritate the pulp and cause sensitivity
D) prevent a line of black stain around the restorations