My Futurist Hat is on:
I had this idea about five years ago. It has advanced some – a Swiss company – http://swissdent.ch/en/ uses nanites in its paste to white and strengthen teeth. I have been thinking about something more comprehensive.
A toothpaste with nanites to clean teeth, clean plaque build-up – acting like floss and cleaning plaque below the gum line. I imagine dentists would have this first and then each of us would have a kit to use every month eliminating the need to clean teeth at the dentist. If one swallows the paste (no fluoride) the nanites would perish in stomach acid.