I'm not sure if this will be any help or not, but my girl Brodie was born with quite a severe underbite. Her teeth were misaligned and she ended up getting three front teeth removed in order to correct things. However, before this was done, my vet took X-rays (she was getting spayed at the time, so she didn't need to go under a separate anaesthetic) and sent them off to a specialist. It was only after we got his opinion that the teeth were removed.
I was warned that she may need further surgery when she got older, but she's now seven and there's no sign of that being necessary. She's been left with stunted canines, but that's it. She doesn't like picking up heavy objects, but that's really the only way that I can say it affects her.
I'd definitely ask for another opinion, as the first vet I saw said we might as well remove the teeth since she is insured
. The next vet disagreed and got the X-rays sent off. Hopefully surgery isn't needed, but they do recover quite quickly from it if he does.