All fangs use a specially formulated dental material for the tightest fit. Scarecrows original patented approach means there's no boiling water, no adhesives & no unsightly, complicated thermoplastic partial plate to construct. You get a tight, realistic, rigid snap-fit in 5 minutes without modeling plastic around any other teeth. It's easy & your fangs snap in and out easily. Everything you need to fit your fangs on the spot is included with no additional utensils required. Truly the best fangs available!