T-Rex: So uh, it turns out that the fluoride in toothpaste is, um, TOXIC. POISONOUS. There's enough fluoride in a tube of toothpaste to END LIVES. Dentists weren't joking about not swallowing toothpaste!

T-Rex: Dentists weren't joking about a lot of things!

T-Rex: This is super concerning, Dromiceiomimus! I've been putting poison in my mouth, TWICE A DAY, and RUBBING IT AROUND. Three times a day if I'm lying to my dentist!
Dromiceiomimus: There's barely enough in a tube to kill a child, T-Rex, and that's if they eat it. It'll take much more than a tube of toothpaste to take you down!
T-Rex: How much more? TWO tubes? THREE?

T-Rex: I'M PRETTY SURE YOU CAN BUY THEM IN BULK.
Utahraptor: Man, you're looking at this the wrong way!

Utahraptor: For years, you've been dosing yourself - twice daily - with a tiny amount of poison. If anything, you've built up an immunity!
T-Rex: ...Oh my gosh, you're right! I MAY WELL BE IMMUNE TO FLUORIDE POISONING.

T-Rex: Assuming immunity works like in the movies! And also assuming that, rather than swallowing the poison, I just rub it all over my teeth.
T-Rex: And the best part is: that's what I was ALREADY planning to do anyway!