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2. Tooth whitening - Wikipedia

   en.wikipedia.org/wiki/Tooth_whitening

   However, it was not until 1989 that Haywood and Heymann published an article in support of this method. Carbamide peroxide with a shelf life of one to two years, as opposed to hydrogen peroxide with a shelf life one to two months, was seen as a more stable agent for whitening teeth. [84]

3. Teeth whitening: What is it, how to do it safely and how to ...

   www.aol.com/lifestyle/teeth-whitening-100042380.html

   Rhonda Kalasho, DDS, explains that these trays typically use low concentrations of peroxide-based gels, such as 15% hydrogen peroxide or 35% carbamide peroxide. You usually wear a whitening tray ...

4. Period-after-opening symbol - Wikipedia

   en.wikipedia.org/wiki/Period-after-opening_symbol

   The EU Cosmetics Directive defines in Annex VIIIa the language-neutral open-jar symbol, which manufacturers should use to indicate this period. The time period is most often represented compactly as a number of months, followed by the letter "M", as in "36M" or "36 M" for a period of thirty-six months, written either onto the front side of the ...

5. Hydrogen peroxide–urea - Wikipedia

   en.wikipedia.org/wiki/Hydrogen_peroxide–urea

   Hydrogen peroxide–urea (also called Hyperol, artizone, urea hydrogen peroxide, and UHP) is a white crystalline solid chemical compound composed of equal amounts of hydrogen peroxide and urea. It contains solid and water -free hydrogen peroxide, which offers a higher stability and better controllability than liquid hydrogen peroxide when used ...

6. Tooth enamel - Wikipedia

   en.wikipedia.org/wiki/Tooth_enamel

   The agents most commonly used to intrinsically change the color of teeth are hydrogen peroxide and carbamide peroxide. Oxygen radicals from the peroxide in the whitening agents contact the stains in the interprismatic spaces within the enamel layer. When this occurs, stains will be bleached and the teeth now appear lighter in color.

7. Is It Safe to Use Expired Vitamins? The Truth About Vitamin ...

   www.aol.com/vitamins-expire-nutritionists-weigh...

   The best way to store vitamins for optimal shelf-life. Elements like heat, humidity, light, and air are the “main enemies of vitamin freshness,” says Blatner. “Keep them cool, dry, and out ...

8. 9 Costco Brand Items That Aren’t Worth the Money - AOL

   www.aol.com/finance/9-costco-brand-items-aren...

   Like milk, deli meat has a pretty short shelf life once opened. In addition, chef Lizzy Briskin with Insider rated products she would never buy at Costco, and one of them was Kirkland brand pre ...

9. AOL Mail

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   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!