The in-office bleaching solutions are the strongest, so precautions must be taken by the dentist to protect the gums from coming in contact with them. As for comparisons among the three options, one study found that a six-shade change required either: three in-office applications of 38% hydrogen peroxide one week of 10% carbamide peroxide used at home nightly in a custom-made tray or 16 daily application of 5.3% hydrogen peroxide on a strip. A 10% carbamide peroxide treatment in a custom-fitted tray is generally the safest, most cost-effective, best-researched whitening treatment available.
Of course, your own preferences, lifestyle, and finances will also come into play when making a treatment choice.
It's important to keep in mind that all three of these options should eventually achieve the maximum whiteness allowed by the tooth given enough time to work.
This has not been proven.
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