Fangs

A Vampire's fangs are not always visible, as many people should think, they only appear at a certain time and can be controlled.
They appear at night, when the vamp is supposed to haunt, but he can controll them and hide them until he needs them. They're not as long as humans think, they are just a bit longer than when humans and they have two basic functions:

1. Extract blood

The fangs have an opening that works as a straw that pulls out blood from the prey, we can extract all the blood of an adult human in almost 15 seconds.

2. Segregate the vamp's toxin

This time, instead of the opening absorbing blood, it lets out the Vampire's Toxin, which turns the victim to a new vampire within a day or two. The human will seem to be dead meanwhile the toxin reacts in his body and makes him turn. Sometimes they are found and buried, this makes the myth vampires are living death.