The equine dentists are not legally allowed to administer anesthetics; a
vet has to be on hand to anesthetize each horse seen by the dentist. The
last time the dentist was out, he did 5 horses and the vet hung around
for a few hours while this was being done. The vet charged me $20. and I
paid the dentist seperately.
I don't believe they are licensed in each state, but there are two
associations that certify vets. The schooling is intensive and much,
much more then a vet would get on teeth.