I forgot to mention i tried the * Pearl * brand years ago yep didn't do a thing.

Like Lulu said i too would much prefer to have done at the Dentist (but can't afford any time soon) !!

I did have a go at whitening my teeth at my Dentist in Melb about 15 years ago when the guard cost me about $350 then & interesting enough the tube of whitener was dearer at $50. I wore it for 7 days & found my teeth were incredibly sensitive when drinking or eating. And cause it didn't make a difference the Dentist said some people's teeth don't take to it so therefore don't whiten anymore ... so i must have thrown the guard out ages ago as i can't find it (must have since it didn't work for me). Now my new Dentist said what a shame i don't still have it as they are so costly now. She just mentioned that to me about half a dozen times and i just wanted to cry, ahhhhh

I might give the Colgate one she mentioned a go but she warned me it's not always as successful and doesn't last as long