Just had a new equine dentist out to do our three. Came recommended by our showing producer and he was great. Previous dentists (including our vet who does dentistry) had just used hand rasps. This guy had electric tools with various handles and heads that could reach easily right to the back to target specific problems. He'd trained in USA and it really showed as all the latest technology.
The horses were very well behaved with him and he got us feeling up their mouths to show the before and after on particular issues. The connemara, in particular, should be much better off now and can't wait to ride them again!