BlanX Extra White is an intensive whitening treatment which you should use as toothpaste. According to the packet, after two weeks you should see visible results and the toothpaste comes with a “BlanXometer” to measure how white your teeth are at the start of the two weeks and the end.
I’ve used the toothpaste religiously for two weeks and although it has a nice minty taste it doesn’t seem to have made my teeth any whiter – I used the BlanXometer to measure! It does say that BlanX is especially suitable for smokers and drinkers of tea, coffee and red wine. I don’t smoke and rarely drink those drinks so maybe it just isn’t a great treatment for my teeth.
If you do want to try this treatment then you can buy it here.