I have just had my teeth whitened by my dentist... Well you get given the gel and some trays to fit over your own teeth to do yourself. The verdict: Well worth the money. I paid �300 but now have perfectly white teeth, which have had no sensitivity at all during the treatment. Treatment took around 6 weeks but I am assured that I will only need to "top up" once a year or less. The problem with a lot of Internet tooth whitening products is that the peroxide will 'eat' into your enamel and make it porous and therefore create sensitivity and POSSIBLY undermine your teeth.

The PolarWhite that was prescribed to me by my dentist actually hydrates the tooth and protects it (so he told me...) I hope this helps you, if you have any further questions then contact me through Handbag!