On this case we completed today, we moved a patient from a A4/C4 to a B3. In-office whitening uses a process where we retract the lips and isolate the gum tissues using a soft light cured resin. The process takes about 1 hour. We do 3 applications of 38% H2O2 bleach gel to the teeth. Each session of the three applications is kept on the teeth for 15-minutes. Then, between each set we clean the teeth off and reapply fresh whitening gel.
To get a sense on the shade guide organized by hue, chroma, and value from lightest to darkest. Here is what it means to move from C4 to B3.
So, the before and after on this case was really an awesome improvement.
Hope you like it,
RM