Hydrogen Peroxide vs Carbamide Peroxide. Which one is more effective at whitening your teeth?
In a study by the Journal of the American Dental Association, both CP and HP were equally as effective in whitening teeth. The study compared 7.5% hydrogen peroxide with 20% carbamide peroxide. That is roughly the same concentration of HP when you take into account the 1:3 ratio. During the first 14 days, the CP lightened the the teeth more. However at the end of the study, both products whitened the teeth to a similar level.
Dr. Banić