Shapeshifting micro-robots can brush and floss teeth

The micro-robots are built from iron oxide nanoparticles that have both catalytic and magnetic activity. Researchers could organise their motion through using a magnetic field. The robots can form bristle like structures to sweep away plaque, or elongated strings that can slip between teeth like a length of floss. A catalytic reaction in the particles causes the nanoparticles to produce antimicrobials which kill harmful oral bacteria.

The result?

These micro-robots nearly eliminate the biofilm that leads to cavities and gum disease.

The customizable nature of the system, the researchers say, could make it gentle enough for clinical use, but also personalized, able to adapt to the unique topographies of a patient’s oral cavity.