No. I swear, most dentists do this automatically. My orthodontist used to put those flouride gel mouth guard things on my teeth and make me sit there for 1/2 hour. I would be so nauseous when I left, and sometimes threw up after the visits.
I saw Brooke Shields in a Colgate commercial the other day. In the commercial she was brushing and brushing her teeth, talking about how she wants protection, not for a few hours, but for 12 hours.
At the end she says "Colgate, its the only toothpaste I have ever used"....yikes.