I get this question quite often in interpreting the actual strength of whitening products. In general, carbamide peroxide converts to approx. 3 times less hydrogen peroxide. (i.e. 22% carbamide peroxide is generally equivalent to 7.5% hydrogen peroxide). Ask your dentist about the comparative strengths and weaknesses of dentist delivered vs. off-the-shelf whitening products.
Hans Skariah, B.Sc., DMD
Promenade Court Dental Health Group in Mississauga
2233 Hurontario St., Mississauga, ON, Canada
(1/2 km north of the QEW in the Dome Building)