No they don't.
Yes, all vampires are said to have fangs.
yes they can have rear fangs which are used to puncture the frogs vocal bag
Yes Sesshomaru has fangs. He like his brother, has fangs when a dog-demon or when plain demon. Inuyasha and Sesshomaru have fangs.
It comes with a pair of fangs, so yes, two fangs (not two sets of 2).
yes
Yes and yes
Yes, Tyra Fangs is a judge in the Underground Disco.
"YES"
yes some of them do!
Yes in fact they do.
Yes they do have eyelids