I think as long as the LVT and DVM are comfortable with this, it should be allowed. I was just talking with one of my doctors yesterday about, how sometimes it takes longer to suture up that site than the actual extraction!! If we can free up the doctor, (we all know dentals are an LVTs job ;) and the docs just come in for the extractions) and help in any way we can, lets go for it! The motto at our clinic is: work smarter, not harder.  I don't want to speak for every clinic, of course.  I know some doctors enjoy dentistry, and suturing, and that's great!  It's just nice to have the option to help if the doctors are in a bind.  It's  important to stay open minded about these kinds of things, veterinary medicine is always changing and advancing in many ways!