SO what percent is right for my custom made bleaching tray?

(For which method of bleaching is right for you click here.)

The higher the percentage of either carbamide or hydrogen
peroxide the faster it works.  Whatever
percentage carbamide is then you can divide that by 3 to find the equivalent in
hydrogen peroxide.  So 18% carbamide
peroxide is 6% hydrogen peroxide.  The
only reason to not just always use the highest percentage and get done faster
is that the higher the percentage that you use the more likely you are to experience
post bleaching pain and/or the more severe the sensitivity will be.  This sensitivity will also be more severe to
anything cold.  The sensitivity is
nothing permanent and is NOT doing any damage to either your tooth or the nerve
in your tooth.
Knowing all that we usually start people at 10-15% and let
them dictate the percentage from there.
It all comes down to what percentage you can tolerate without getting too much sensitivity.
Quick reference
Opalescence instructions for wear time
The 10% is not
shown but is for overnight use or 8-10 hours
Bryan Bauer, DDS, FAGD
Wheaton General and Cosmetic Dentists


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