I'm trying to make vampire fangs with fake nails, but they dont stick?

(And dont rag on me for not buying real ones I couldn't find any, live in a small town with no shops) I cant use the glue that comes with the nails cos it says 'call a docor if ingested' (I ume if im putting it on my teeth im going to eat it accidently), the adhesive doesnt stick to my teeth and I've tried a couple of other things but they just fall off after two seconds. HELP!! (And they really have to household items cos all the shops are closed and i need it tonight). And it would help if its non toxic.