I wore these with a werewolf costume on Halloween. I was skeptical; I remember the old method of mixing the pink putty and having your 'fangs' fall out repeatedly unless you shoved some type of denture bonding agent into them or held them precariously in place with your lips or tongue. But THESE fangs are FANTASTIC. If you mix them correctly, (which, I screwed up once but the company gives you enough materials to try it again correctly) the fangs will click perfectly into place and STAY there. I actually kind of made a mistake and didn't take them out to 'set' or harden... and the fangs stayed on for about six hours and were pretty difficult to remove -- which is wanted I wanted so it worked out perfectly. I was tugging on them and eating (very... very carefully) with them and drinking also, and the things stayed on PERFECTLY. Had to YANK them off at the end of the night, and I could still pop them back on and off whenever I wanted. Beware though, they are actually quite sharp and if you keep them in for as long as I did, they will start to create little sore spots in your mouth. But what do you expect? You're wearing a new dental appliance. It reminded me of when I got braces for the first time and the inside of my lips/mouth become very sensitive to the irritation. *shrug* Well worth having fangs that stay on all through a wild party, in my opinion ;)