Hello,

I was just wondering, what is the accepted wear time for 22% carbamide
bleaching solution? Thing is, I've read that up to ~15 carbamide is ok
for wearing overnight but 22% is 1 hr only. Obviously it is a higher
concentration but is that purely to reduce sensitivity? I've read that
over 50% of the active hydrogen peroxide is still present after 1hr
and I'd like to get the best value out of the bleaching paste.

What I'm trying to say is, is it ok to wear a little longer say 2hrs,
without it adversely affecting the enamel? I can put up with a little
sensitivity.

cheers