The gel’s oxygen molecules break down the discolored bonds and spread throughout the inside of the tooth (Haywood, 2004). The trays themselves don’t do any of the bleaching work-it’s the whitening gel, usually around a 22% carbamide peroxide mixture, that seeps into your porous enamel and interacts with the discolored molecules in your teeth. Just buy a gel refill, keep one or two in the fridge, and you’ll never have to worry about being out of luck again. The good news? You don’t have to go through the entire tray-molding process again. Some clients prefer to whiten only the week before a big event, like a wedding, and ignore the gels the rest of the time. Or else they’ll use the gels up, whiten their teeth, and find they reverted back to an off-yellow a year or two later. If you’ve bought a whitening tray, you’ve made a long-term investment-your mouth won’t outgrow your custom-fitted mold anytime soon, and your gels, if stored properly, could last for years.īut sometimes customers buy custom-fitted trays and gels, use them a few times, only to fall out of the habit and let their gels expire.
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