by 
The Curious Bag
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<h4 class="dechead">On One Hand: They Are Mild
Tooth-whitening products that you can buy at the grocery or drug store are very mild. Most of them contain a bleach and peroxide mixture that is very weak, according to ToothWhiteningPortal.com. Because they are mild, they will not negatively affect tooth enamel or the teeth as long as they are used correctly.
On the Other: They Must Be Used Correctly
If used improperly, you could damage your teeth. People who use the whitening products too often or leave them on longer than directed can wear away their teeth's enamel. Tooth-whitening products also could irritate your mouth's soft tissue if overused. People with sensitive teeth might have problems with tooth-whitening products.
Bottom Line
When used according to directions, tooth-whitening products are safe, especially if you do not have sensitive teeth. Talk to your dentist about the safest products for your teeth if you have any concerns.
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