Originally Posted by MollyJean
They don't have teeth, and as far as them being "Fighting fish" goes, if that's the root of your concern, a betta's tail is very delicate, so if a betta bites a betta tail, it might do damage, but that's like you or I biting a chunk out of toilet paper. Betta fins are easy to damage. Your finger is not.
Bettas do have teeth, and very sharp ones. I was hoping I could find a picture of FB a breeder took recently of a betta's mouth.
BUT they won't hurt you. It's like you trying to sink your teeth into the skin of a very large watermelon suspended in the air, it just won't happen!