technology in your toothpaste -->
The Consumer Products Inventory lists more than 1,600 products that are identified by the manufacturer as containing nanoparticles. So let's take a look at what's inside your household items. This week: toothpaste.
There are three main toothpaste ingredients that may be made of nano-sized particles:
Hydroxyapatite, cavity filler
Hydroxyapatite is a lattice of calcium found naturally in teeth and bones. It helps prevent tooth pain associated with sensitivity. Coating the teeth and slipping into tiny cracks, it breaks down in response to acid before your enamel does, protecting the teeth from decay and cavities.
Hydroxyapatite also provides a source of calcium and phosphate ions which, combined with fluoride, help to remineralise the tooth surface.
Silver, bacteria killer
Silver nanoparticles are proven to have antibacterial properties, reducing the risk of gum disease and bad breath caused by bacteria in the mouth. Its distribution in toothpaste remains largely limited to manufacturers based in
Titanium dioxide, whitener
Titanium dioxide is an intensely white pigment. It has a high refractive index, which means it scatters light to create a very white product. Titanium dioxide is widely used in toothpaste, but often the particles used are not small enough to be defined as nanoparticles.
A number of popular brands still do not contain nanoparticles. From those we contacted, Oral-B and Boots responded to confirm that their products do not contain nanoparticles, while Colgate states on its website that its products are currently nanoparticle-free.
Research into the safety of nanoparticles in toothpaste and other everyday products is ongoing. Widely used silver nanoparticles are an area of particular concern, with studies showing that this substance could make its way from the mouth to accumulate other organs of the body.
Nina Quadros, associate director for
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