- Leigh has a tricky serve, but I'm pretty fast on my feet. We're even stevens, except once I walloped Leigh. In a toothpaste test, Mr. Cameron. 

- Tell us about it. 

- At school, dental scientists divided us into two groups. 

- They put an equal number of people with good and bad teeth in each group. 

Mr. Cameron: And then? 

- For two years, both groups brushed as usual, including after lunch at school, but with a different toothpaste. 

- Turned out my group had a control toothpaste. 

- Mine had Crest, and my group had 21% fewer cavities with Crest. 

- With results like this, I don't see why anyone should take a chance on cavities. You see, Crest with Fluoristan combines with tooth enamel like this, to strengthen it against decay. That's why in 12 years of testing, only Crest has shown it reduces cavities 21% to 49%. So why take a chance on cavities? 

- Have regular checkups. 

- Watch between-meal treats. 

- And brush often with Crest.