I read reviews of lots of similar products, but this item got the most positive reviews.  I placed the order and got shipment confirmation the same day, received delivery within three days.

As most other reviewers said, these fangs appear to be dental-quality, almost like caps.  They blend perfectly with my own teeth for a very realistic impression.  Once they are molded to your teeth, they stay in place with no problem and remove easily - great product!

The only downsides that I see:

1) There does not appear to be any way to remove the molding material and start over in the event that the fit is less than perfect.  The instructions state that more molding material can be added for a tighter fit, but one fang ended up being a little out of line with my teeth, not something that more molding can address.

2) The molding material discolored after a couple of days' storage.  It doesn't affect the fit or their appearance when the fangs are in place, but it just looks unappealing on something that is going in my mouth.