rewrite this ad so it will be more effective:

Question

Three thousand five hundred dentists surveyed recommend sugarless gum to their parents who chew gum

Answer 1

parents??

I'd use a percentage, rather than 3,500.

I'd also leave off the last three words.

Answer 2

I'm sure it's "patients"

And, the actual ad reads like this.

Dentists don't just recommend sugarless gum to everyone. But if you already chew gum, then they do recommend sugarless gum.