- Meet Mary Susan Lefever. One of her parents took part in a toothpaste test that showed Crest reduces cavities. Can you tell who it was? Let's ask Mary Susan. 

- My daddy. 

- (laughs) good girl. When was the test, Mr. Lefevre? 

- When I was a student at Indiana University. 

- How'd your group make out? 

- Not as well as the other group. 

- Because? 

- We used regular toothpaste. 

- While the others used Crest. Now here's the story filmed at the university. On this side, they used regular toothpaste and over here they use Crest. Mr. McLean, did anyone know which toothpaste was which? 

- No, we did not. 

- How many took part in the test? 

- About 250. 

- How old were you then? 

- We were sophomores and juniors. About 19 or 20. 

- Thank you. Mr. Lefevre, did you brush any special way? 

- No. They told us to brush as usual. 

- Who told you to do that? 

- The university scientists running the test. 

- Thank you. The results: after two years, the Crest group had 34% fewer cavities, 34%. Such results show why Crest is the only toothpaste recognized effective against cavities by the American Dental Association. Their Council on Dental Therapeutics reports, "Crest has been shown to be an effective decay-preventative dentifrice that can be of significant value when used in a conscientiously applied program of oral hygiene and regular professional care." Protect your family with good dental habits, checkups twice a year, and Crest, the only toothpaste recognized effective against cavities by the American Dental Association.