Kez is sometimes sedated coz he's a pig. However he didn't require sedation this year thanks to a patient, skilled new female vet (Kez likes ladies!). I'd kick the vet off my yard if they wanted to sedate my other two. They don't need it, it's unnecessary. You do have a choice, you can get someone else to do teeth or speak to the practice manager/partners. I'm sure they have hand rasps they could use. With my last vet I used prior to moving, I laid down the law as bad experiences with a number of their vets meant I'd only allow two or three to treat my horses for routine appointments. They were actually very co-operative. I'm sure you won't be the only client unhappy about routine sedation. It also strikes me as an excuse to bump up the bill!!
They don't charge for sedation so it makes no difference to the cost.