Professional in-office whitening uses concentrations up to 40% hydrogen peroxide with isolation of the gums. Results appear in a single visit but at premium cost.
Dentist-dispensed take-home kits use custom trays with 10-22% carbamide peroxide over 1-2 weeks. Results are comparable to in-office over a full course, at a lower total cost.
Consumer strips and LED kits use lower concentrations without gum isolation. Results are meaningful, if slower.
The typical middle ground: a course of dentist-supervised take-home trays for the initial change, followed by consumer maintenance.
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Ira Zoot is not a licensed dentist or clinician. As the site's independent editorial reviewer, Ira reads every page before it ships and cross-checks the underlying claims against published guidance from the American Dental Association (ADA), the U.S. National Institutes of Health / NIDCR, and Cochrane Oral Health reviews. Any clinical decision should still be made with your own dentist.