Plasma Jets Could Replace Dental Drills

A new study shows that bacteria-killing jets of plasma could soon replace the drills used to treat cavities in our teeth, making visits to the dentist’s office a bit less nerve-racking. Plasma is the fourth state of matter, after solids, liquids and gases. It is formed when gases are energised to the point where electrons fly off some or all of their atoms. Researchers recently demonstrated that a small, blowtorch-like device emitting a relatively cool beam of purple plasma can eliminate oral bacteria in cavities, leaving more tooth structure intact than a drill does