Whiter teeth

My teeth were looking a little on the yellow side so I decided to give Smirk a go. I took a before picture with the intention to take an after picture one week later. However, after using this for the first time, there was a instant difference. After using it daily for a week, I was then able to maintain the whiteness by using this once or twice a week. Its a nice mint flavour and you only need a small amount to make a big difference, meaning it lasts ages