I wonder how it would go repairing dentures? Dental prosthetists may not be so readily available in TEOTWAWKI.
I've used this technique to repair my dentures. Still wearing them with the same repair going on 3-4 years now. A similar fix,cabosil and super glue, used for a friend who had a rockstar moment(or maybe just drunk) with a Les Paul copy and snapped the neck. Has been in place for maybe ten years now. For better finishing characteristics use cabosil and JB Weld mix. But yeah, baking soda as well as flour has been used as a bulking agent in many adhesive applications.