All of a sudden it becomes worthwhile to remove all the artificial material in the tooth, put in a shaped sponge and add a protective cap of some sort. This is something we can do for an entire mouth at one go because we are mostly removing fillings perhaps over several days and cleaning up.
Then we have a single session to emplace the sponges and add a protective cap of some sort. This does not need to be too strong or even fixed so long as the sponge is well set and fixed.
Then you would likely have to spend the next two months sucking smoothies while the drug was applied and the dentine went into full growth cycle.
None of this is unreasonable and will also work wonderfully alongside the introduction of new living teeth to replaced those lost.
I actually think that we are already less than five years out and our dental profession will be busy rebuilding mouths for everyone.