A jocular name for a tooth-drawer; so called from a dentist of the name in the reign of Queen Elizabeth. Kindhart, the dentist, is mentioned by Rowland in his Letting of Humours—Blood in the Head-vaine. (1600); and in Rowley's New Wonder.
Mistake me not, Kindhart He calls you tooth-drawer.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894