It's a Blue Dental Curing Light.
Light curing refers to the method by which certain dental materials are tranformed from a liquid or gel form to a solid. Dental composites (tooth colored restorations) cavity liners, and sealants can all be light cured. They start out in a fluid or semi-fluid state, and when the dentist has placed the material as desired, a very bright blue light (called a curing light) is shined on the material for a few brief seconds. The material immediately is tranformed into a solid immovable state. This method has been in widespread use throughout dentistry for more than 30 years.
Nobody invented sandstone it is a naturally ac curing substance in the earth.
Electric Dental Drill
Nobody invented it, it was the dentist who make's it
1892
Pierre fauchard
adem langly
gilckman
Dr.John Cummings in 1895
He invented the first dental gum, Dentyne
My grandfather Alec King