What about Pearl Drops Instant White;
www.tesco.com/superstore/xpi/9/xpi61228139.htm

Tesco have it on offer from £6.99 to £4.99 at the moment, has anyone tried it ? I guess it's just like Tippex !
But it does say it stops on all day till you brush it off at night ??
Edit: or until you eat a meal

Or I think I might order the Pearl Drops Hollywood White reduced from £4.69 to £2.69
www.tesco.com/superstore/xpi/8/xpi51923268.htm

It's just arrived, and it says guaranteed 3 shades whiter in 3 weeks ! Brush with it twice a day - so I'll keep you posted

Oooh thanks Can't wait to hear.

My teeth are really weird, like one of my front teeth goes backwards, it's really dodgy. And anyway, they told me when I was about 14 that there was nothing they can do about it, so of course, I left it. But now I'm 17 it really effects my confidence so I went to the dentist and literally demanded they do something. So they have sent me off to the orthadonist, but they're not guaranteed to accept me because of my age (which isn't my fault, it's the dentist's fault)! So hopefully, they can sort my teeth out