My HN comment, linked to as [0], was on a submission about the history of NovaMin - iirc it was originally used for soldiers in Vietnam, then came to be used fo

My HN comment, linked to as [0], was on a submission about the history of NovaMin - iirc it was originally used for soldiers in Vietnam, then came to be used for repair of teeth. You can do your own experiment: $10 for a tube, plus $6 shipping. If you have sensitive teeth it’s worth a trial.