told me in an email that hydrogen peroxide or carbamide peroxide are “most effective in a gel form that is held against your teeth (think whitening strips, gel in trays, etc.).” Each method ...

These kits use highly concentrated whitening gels. Usually, these gels include hydrogen peroxide or carbamide peroxide, though you can find some with gentler ingredients. While there are countless ...

LED teeth-whitening kits typically include a light tray and gel. These trays are worn for 30 to 60 minutes ... Another popular and budget-friendly option, this whitening kit uses carbamide peroxide ...