Observation of horses teeth dates back over 2000 years.
Floating of horses teeth dates as far back in England to the 1600's.
The Germans had equine dental charts dating back to the 1800's
Floats and other instruments have been dated back to 1817.
Power tools came into existance in 1895.
There are over 122,000,000 Horses , Mules, & Donkeys in the world today.
A horses teeth continue to erupt their entire life about 1/8th of an inch a year.