Pondering teeth

I HATE that toothpaste advert that tells me that 40% of my teeth are actually between my teeth.

I also hate the toothpaste advert that tells me that 45% of my teeth are below my gums.

Which is true?

Surely both can't be. That would mean that I can only see 15% of my teeth which frankly is just stupid.

Which is it toothpaste people!?! Which is it?! WHICH IS IT!!!