the dental drill

Bur John Greenwood was the first U.S. president George Washington's dentist. Washington made his dentures and used by his mother's spinning machine to change

Made a wonderful device for the Washington dental drill.
Greenwood pedal pedal driven dental drill. However, his device does not promote the use of dental doctors still hand turning the handle to drive the dental drill. Anesthesia

Drugs used first by the fact thatdental handpiece  the dentist, indicating early dental drill and make painful extractions.
In 1858, George Harrington invented the first motor-driven dental drill. Dental drill attached to the dentist's hand holding a watch-like device. Other

The motor-driven `have invented dental drill. Some are electric, some pneumatic. Today's dental drill speed is very fast, so you need to use ice water jet to

Prevent the drill bit temperature is too high. The application of local anesthetic so that the patient does not feel pain almost.