Bubbles has overgrown molar roots and, unless the molars are already loose, vets aren't usually keen to remove them as it's a major procedure that comes with the risk of shattering the jaw bone in the process.
I think nessar might be referring to a relatively new procedure that some vets have been trialling in which they remove the pulp from the affected teeth; there is more info about it on this thread
http://forums.rabbitrehome.org.uk/s...ble-Hope-For-Rabbits-with-Molar-Spur-Problems
Diet is usually the first thing to look at but, with tooth root problems, it can often be a balancing act between making sure they eat something and getting them to eat more abrasive foods &, if the teeth aren't lining up, then no amount of hay is going to help in the long run but can slow the process. Bubbles won't eat hay at all now as it's just too painful for her (even with daily pain relief) but she will eat huge quantities of grass (which is just as good as hay for wearing the molars) and also a lot of weeds - plantain, dandelions etc (both dried and fresh).
Sending lots of vibes. xx