Good luck to your boys (and you) with their first teeth descaling!
Tibby and Molly have both had a dental, both of which required extractions due to cavities under the gumline - which they discovered once under anaesthetic.
Because of the extractions, I was prepared to have some very soft wet food for them on their return home (only a small portion). I would be prepared for that, just incase, so you don't end up rushing around trying to get something (if required) once they're home!
I'm sure it'll all go well!