Messina says, you'll be whitening your tooth enamel itself rather than the tartar or buildup on top of it. Not to mention, if you do the whitening right after having your teeth cleaned at the dentist, Dr. That's why it's always good to have a thorough examination done by your dentist before starting on a whitening program." "If somebody has cavities or periodontal disease, or some other reason why their teeth aren't white, whitening is not the right choice for them. "Tooth whitening is something that should only be done in a healthy mouth situation," he says. Before you do so, though, consider taking a trip to the dentist for your standard teeth cleaning and to consult on your at-home whitening plans. Messina says you can use it for 7 to 10 days to start, and then once every other week or so for maintenance. Messina notes that aside from the peroxide, over-the-counter whitening products usually contain some additional ingredients to improve the taste. "This helps the manufacturer to ensure product quality and consistency at the consumer’s end." Dr. "Carbamide peroxide is used because it's a comparatively stable compound," Neil Hadaegh, DDS, a board-certified cosmetic and restorative dentist in Beverly Hills, California says. Messina says peroxide causes that bubbling to occur, so the active ingredient in whitening kits you buy will be hydrogen peroxide or carbamide peroxide (a diluted version of hydrogen peroxide). He explains that removing stains within the matrix of the tooth enamel is like getting out dirt stuck in chicken wire: "So what happens in whitening is we want to…open the matrix and bubble out that color, the stain, and then close it back up." "If you were to look at tooth enamel under a really powerful microscope, kind of looks like chicken wire" (or wire mesh). Messina, DDS, a board-certified, Ohio-based dentist, and spokesperson for the American Dental Association (ADA), says.
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