Currently Tesco have their Colgate advanced white and Colgate deep clean whitening for £2.50 each.
There is also a multi buy on currently where it is 2 for £3 so you would get a toothpaste for £1.50 each.
Then if you go on checkout smart they have £1 back on both and these can be used more than once.
If you stack these two together you get a Colgate whitening toothpaste for 50p!!!
Hope this helps!
Hopefully everyone has this deal on checkout smart!