I actually bought the denture adhesive for my cosplay fangs and it works great for those. The fangs feel more secure than the stuff the fangs come with and it was easy to remove them. I dab a tiny amount on a toothpick, spread it onto the fang, place the fang in warm water for a minute to help thin out the adhesive, and popped the fang on. It doesn't say to put the denture in warm water on the bottle or packaging but I saw a Youtube video by Anthony Markiewicz, DDS, FAGD and he recommend putting the denture (or in my case fangs) in water for a minute. He doesn't say if the water should be warm but I thought that would work best.
For those of those who are wondering the fangs I used are Scarecrow Small Deluxe.