Shapeshifting microrobots can brush and floss teeth

https://penntoday.upenn.edu/news/penn-dental-engineering-shapeshifting-microrobots-can-brush-and-floss-teeth

"optimized motions of microrobots on small slab toothlike material... tested microrobots’ performance adjusting to complex topography of tooth surface, interdental surfaces, and gumline... 3D-printed tooth models... eliminate biofilms, clearing them pathogens.. iron oxide nanoparticles FDA approved for other uses, and tests of the bristle formations on an animal model showed that they did not harm the gum tissue"

Related:

90% Reduction: Scientists Discover Natural Molecule That Eradicates Plaques and Cavities

https://scitechdaily.com/90-reduction-scientists-discover-natural-molecule-that-eradicates-plaques-and-cavities/

Humans Have a Third Set of Teeth. New Medicine May Help Them Grow

https://www.yahoo.com/lifestyle/humans-third-set-teeth-medicine-150000910.html