Although this is correct, it is shocking how fast they can decompose, or rot, once cavities set it. I have a dentist phobia and am losing most of my teeth these days. I wouldnt imagine many zombies have regular dental checkups. Luckily, I can get dentures. Imagine a zombie “Hold still, Im trying to get my dentures in”.
If by breakfast you mean the breaking of the fasting, I’d be starving.