Antibiotics is something that he might be put on after the procedure. It would be given so that he dose not get an infection. If he isn't eating hay, he could end up being a very expensive rabbit for you. There is only a 25% chance that he won't make it through the procedure, and he will have to have it done again and again unless he is eating hay. My foster had his teeth done every 3 to 6 months and he lived to be 12. He belonged to a no-kill rescue, so they paid the bill. The view of the vet and the rescue was that once he got his teeth done, he would be happy. The roots of his teeth would affect his eyes and his eyes would water, and he was in pain. He would get his teeth done and his eyes would stop watering, but since rabbits hide their pain, it was hard to tell how he felt. If he could have talked, I think he would have said, "Let me die," at the age of 8. After that age he never expressed joy, never interacted with people or other rabbits or sought out attention. When I let him out of his cage, he would just find a place to hide. As the foster provider, I should have had say, but the vet and the rescue were determined to save his life, so I did what was asked of me, but I don't feel good about it. If not eating hay so that his teeth are not wearing down properly is your rabbit's only problem, then I think he could be happy after the procedure. If the roots of the teeth are the problem I would stop having the procedures on his teeth done and put him to sleep when his behavior changes to the point that you think he may be in pain. My rabbit was about 4 when I got him. He started needing dental work at the age of 6. He was a nice gentle guy that would never bite when I got him. When I put him to sleep at the age of 12, I had to wear leather gloves to handle him because he would bite so hard. He was in pain and angry. By then his eyes watered even after the procedure and the vet said there was nothing more she could do for him.
