My Twitch has no teeth, either. She eats her dry food, however, they cannot be funny shapes. No triangles, diamonds, kitty faces, fish, etc. She wants/needs round pellets. I also feed her wet food 2x a day.
I fed baby food & canned food after Twitch had her teeth done. You could also try pureeing(is that right?) some canned food if it has larger chunks & she really likes the food so she can have it. Her mouth will be sore for a few days, but Twitch was eating like normal after 2 days. If your kitty isn't eating much, try tuna juice(from people tuna) over canned food. Solid Gold's Blended Tuna was a big hit with Twitch.
If it isn't a problem, I would love to hear updates on how your kitty does after her surgery.