Well you'll be pleased to know the layers aren't in the latest version, so when your IT install 9.0 you will find they are no longer preloaded.
The layers were defined within the default DWT that loads with KeyLINES. If you use a different dwt then you will find different layers when you start your drawing. You will also find that the desktop icon has the dwt in the various bits of the 'target' line of text. You may be able to change that text to another dwt if you so wish.
Many Thanks for asking about it.
There is a command that is more flexible in that it draws around curves and straights, use the 'by picking' item. (or type DRAGONS1)
However this will still do a full set of 20 pairs of teeth.
I was just going to log this wish into our system, when I noticed there is already one there, 'to be able to create dragons teeth with less than the full amount', so I had added your request into that item for you.