The high-speed dental drills that dentists use to remove cavities spin at speeds up to 400,000 RPM—over 25 times faster than Formula 1 engines—requiring specialized micro-lubrication systems built into the handpiece. These drills use medical-grade oils and air-cooling systems because traditional lubricants would contaminate the patient's mouth or interfere with dental materials. The tiny bearings inside a dental handpiece are smaller than a grain of rice but must endure millions of high-speed rotations while maintaining perfect precision to avoid damaging healthy tooth structure. Many modern dental drills use ceramic bearings that need minimal lubrication, but even these require periodic maintenance to prevent the screaming sound that makes patients anxious.