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2. Tooth whitening - Wikipedia

   en.wikipedia.org/wiki/Tooth_whitening

   Tooth whitening or tooth bleaching is the process of lightening the colour of human teeth. [1] Whitening is often desirable when teeth become yellowed over time for a number of reasons, and can be achieved by changing the intrinsic or extrinsic colour of the tooth enamel . [ 2 ]

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

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

   Whitening toothpaste According to a 2018 study , chemical teeth-whitening toothpaste outperforms natural alternatives. Despite this, it isn't as highly recommended as whitening strips or trays.

4. Dentist-Approved At-Home Teeth Whiteners - AOL

   www.aol.com/dentist-approved-home-teeth...

   This brand’s whitening toothpaste is an advanced formula, but while it’s tough on stains, it’s gentle on teeth as it works to re-strengthen weakened enamel. ... But better still, they work ...

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

   www.aol.com/lifestyle/teeth-whitening-safely...

   Brighten up your smile in days or weeks with effective at-home teeth whitening options.

6. Toothpaste - Wikipedia

   en.wikipedia.org/wiki/Toothpaste

   Whitening toothpaste cannot alter the natural color of teeth or reverse discoloration by penetrating surface stains or decay. To remove surface stains, whitening toothpaste may include abrasives to gently polish the teeth or additives such as sodium tripolyphosphate to break down or dissolve stains. When used twice a day, whitening toothpaste ...

7. Hair bleaching - Wikipedia

   en.wikipedia.org/wiki/Hair_bleaching

   Hair bleaching products can damage hair and cause severe burns to the scalp when applied incorrectly or left on too long. [17] Industrial bleaches that work by reduction (such as sodium hydrosulphite) react with a chromophore, the part of the molecule responsible for its color and decrease the number of carbon-oxygen bonds in it, making it ...