First of all, I hope the procedure went well for you. If it was a filling, the only reason we recommend waiting to eat is due to the numbness. We don’t want you biting or burning your lip/cheek/tongue. You are more than welcome to eat soft foods immediately after a filling/crown/root canal, but we do recommend eating on the opposite side that you are numb.
If it was an extraction, we recommend the same timeline for numbness to go away, but I recommend eating on the opposite side of the extraction for 24 hours to give the trauma site initial time to begin healing. For extractions, try to avoid smoking, drinking through a straw, spitting, and blowing your nose hard for 48-72 hours to minimize the chance of dry socket.