Although I am sure there are people that have gotten permanent fangs it may be hard for you to find a dentist willing to do the work. At best just start making phone calls to your local dentist. See if that is something that they would offer.
I do not want to come off like I am telling not to do what you want to do with your teeth. However have you looked into having some very good fake ones made. There are many good sites for that. I noted one link below for you. Just maybe something to think about.
Either way good luck to you