Don't buy a teeth whitening gel before reading these reviews. ... For example, hydrogen peroxide and carbamide peroxide work great in teeth-whitening gels, but must be used as directed.

Tray-based teeth-whitening systems, purchased either over-the-counter or from a dentist, involve filling a mouth guard-like tray with a gel whitening solution that has a peroxide-bleaching agent.

Plus: How to choose a teeth-whitening method and which gels, strips and kits are best for you. Search. ... The collection includes 4 syringes of 35% carbamide peroxide whitening gel, ...

These are the best at-home teeth whitening kits, ... Kosdon says the kit is “reasonably priced,” in part because it comes with enough carbamide peroxide gel for 20 sessions, ...

From teeth whitening strips to toothpastes, here are the most effective at-home treatments for whiter teeth. ... Active ingredient: 35 percent carbamide peroxide | Method: Gel pen ...

“Usually, the bleaching agent will be some form of hydrogen peroxide or carbamide peroxide. Up to 10% peroxide content is considered safe for teeth; any higher, and you will likely damage your ...