Yes, molar scaling under anesthesia, and if any other dental (ie tooth removal due to abcess, though hopefully that's not likely). The risk seems very great for someone 6 3/4 yrs and only in the 800's (grams) for weight. With the front tooth trimmed and possibly a fractured front tooth as she mentioned, am not sure if molar overgrowth would be the only reason he isn't eating on his own, but who knows.
She also stated that we would not be able to have him eat before his surgery, due to possibility of aspiration pneumonia (she said while they technically do not vomit, piggies who have been syringe-fed before visits have extra fluid in stomach which can go into lungs while under procedure, though piggies eating on their own can eat up until the surgery). That's good to know, though my main concern all along has been gut shut-down and bloat due to not having enough in the stomach/intestines consistently or over a period of time.