ok. This is going to be a stupid question I know, and I am already embarassed to have to ask

On the Royal Magic, "amazing things to do with everyday items" dvd there is a trick that requires "Dental Wax". And I haven't a clue what it is.
Effectively it is used for joing the ends of a piece of string to look like it is one piece.
At first I thought it may just be dental floss, but the dental floss I have isn't sticky enough and just doesn't work. So is this some thing used in the States?
I'm being stupid aren't I?
