(news.bbc.co.uk) “Tooth whitening kits have been found to contain illegally high levels of the bleaching agent hydrogen peroxide.

Trading Standards Institute (TSI) tests found hydrogen peroxide levels were higher than the legal limit in 18 out of 20 DIY products tested.

In one case the legal limit was exceeded by a factor of 230 times.

Hydrogen peroxide, commonly used as a hair dye, can aggravate gum disease and cause sensitive teeth – or even chemical burns to the mouth. (more…)