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Whitening products may damage teeth, new study finds

Researchers found the active ingredient in tooth whiteners can eat away at the material covering the sensitive structures of the tooth.


By Linda Carroll, TODAY

The very product you are using to whiten your teeth may be damaging them, a new study suggests.

In three experiments, researchers found the active ingredient in tooth whiteners, hydrogen peroxide, can eat away at dentin, the material right below the protective enamel and covering the sensitive structures of the tooth, according to the reports presented at the annual meeting of the American Society for Biochemistry and Molecular Biology.

Earlier studies showed hydrogen peroxide can penetrate through enamel, said Kelly Keenan, a co-author on all three studies and an associate professor at Stockton University. While other researchers have looked at the impact of the chemical on enamel, “nobody had looked at how it affects the proteins in the dentin,” Keenan said.

The main protein in dentin is collagen, so Keenan and her colleagues focused much of their attention on how hydrogen peroxide impacts it.

An experiment in which teeth — not attached to a human — were treated with hydrogen peroxide was quite enlightening. “With one round of hydrogen peroxide, the collagen went down about a third and with three, it was down to less than 50 percent, Keenan said.

Apparently, the hydrogen peroxide causes the collagen in dentin to break down into small fragments, the New Jersey researcher said.

Keenan and her colleagues also ran an experiment in which they took tooth-derived collagen and exposed it to hydrogen peroxide. “It completely disappears,” she said.

What the researchers don’t know yet is whether dentin damaged in this way can regenerate, Keenan allowed.

Keenan said she became interested in the effects of hydrogen peroxide on dentin after using a whitening product herself. “It made my teeth sensitive,” she said.

Dr. Lee Gause, a dental professor, wasn't surprised to see hydrogen peroxide would have an impact on dentin.

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“It sounds scary because it almost implies that the hydrogen peroxide is dissolving the teeth,” said Gause, a professor of implant dentistry at New York University and founder of Smile Design Manhattan. “But it’s important to appreciate that the cells in the body are constantly in flux.”

For example, Gause said, if you use a loofah while bathing and then look at the sponge under a microscope, you’ll see skin cells on it.

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It’s important to understand how whitening works, Gause said. “The outer layer of the tooth is enamel, which has a crystalline structure,” he explained. “Cleaning it is similar to cleaning glass. The inner part of the tooth is dentin. If you look under the microscope, it resembles coral. If you drink coffee or red wine, or eat chocolate, over time, little by little, some of the particulates get into the little spaces in the coral-like dentin.”

The peroxide molecules get into the little spaces in the dentin and clean out the sediments there, Gause said. And in the process, some of the actual dentin gets removed too, he said, adding, “and maybe losing a little bit of the dentin is a good thing.”

But that doesn’t mean you can’t get into trouble with tooth whitening.

“There is a point where it can be too much,” Gause said. “If a patient wants to come in multiple times a year for tooth whitening, most dentists would recommend against that. There have been cases in which the teeth have been whitened too much and what we find is that after doing that, the teeth become quite sensitive.”

That’s because dentin is the final barrier between the outside world and the tooth’s nerve. The smaller amount of dentin there is, the more sensitive the tooth.

That’s why it’s safer to have your teeth whitened by a dentist, Gause said. “Then you have someone who will make sure it’s done when it’s appropriate,” he added. “The do-it-yourself sort of things will work about 95% of the time. But that other 5% of the time, you can actually do harm. If you do the procedure at home, the only one to point the finger at is yourself.”
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Home Magazine: Whitening products may damage teeth, new study finds
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