Just tell the DDS that you have a blood Sugar issue and that you have to eat a handful of cashews or something every so often. I'm sure they've seen it ALLLLLL before.
My dad has (had) the worst teeth of anyone I've ever seen. Dreadful. He used to leave the dentist's office cursing and complaining that the hygienist was out to hurt him. Now his teeth are false, clack clack.