That's why we only recommend visiting a qualified dentist for tooth whitening as they're professionally trained and will help you to get the results you're looking for safely.' The most concerning two products tested - both teeth whitening gel-filled syringes bought from sellers on AliExpress - contained around 30% hydrogen peroxide or 300 times the permissible amount for use-at-home products.ĭr Nigel Carter, chief executive of the Oral Health Foundation told us that an increasing number of people are looking online for DIY teeth whitening products: 'This is worrying as solutions of hydrogen peroxide used are often above the 0.1% legal limit and this can lead to permanent damage to teeth and gums. The six most dangerous whiteners had more than 100 times too much hydrogen peroxide to be legally sold.20 products contained more than 10 times too much hydrogen peroxide.11 of the 36 contained more than 6% hydrogen peroxide, which is the limit in terms of what dentists are allowed to use.21 of the 36 teeth whiteners tested from online marketplaces contained more than the legal amount of hydrogen peroxide (0.1%) permitted for home use in teeth whitening kits.We tested them to find out how much hydrogen peroxide (the chemical used to whiten teeth) each of them contained and we also tested a widely available high street whitener for comparison. We bought 36 teeth whiteners through online marketplaces AliExpress, Amazon, eBay and Wish. Teeth whiteners come in all shapes and sizes, from gel-coated whitening strips or gel-filled syringes to pens with brush tips used to paint on whitening fluid.īut more than half of the whiteners we tested contained far too much hydrogen peroxide and you could be putting your health at risk by using them. New Which? research has uncovered the hidden dangers posed by teeth whitening products sold through online marketplaces, revealing the unsafe and illegal levels of dangerous chemicals contained within them.

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