India has developed nanobots that destroy bacteria inside the teeth.

The idea is that iron-coated silicon dioxide helical structures can change position and move in space under the influence of magnetic fields. More importantly, they can be either inserted into living tissues or removed after a treatment session. Toothbots can penetrate into the dentinal tubules to a depth of up to 2000 micrometers, after which a change in the parameters of the magnetic field causes them to heat up. The excess heat destroys the bacteria, then the nanobots are removed. Experiments on individual teeth were successful, and now Indian scientists are working to create a new special tool for dentists based on their technology.