Plucked from thousands of orthodontists et cetera (3,2,5)
I believe the answer is:
and so forth
'et cetera' is the definition.
(thesaurus)
'plucked from thousands of orthodontists' is the wordplay.
'plucked from' says the answer is hidden in the clue.
'AND SO FORTH' can be found hidden inside 'thousands of orthodontists'.
(Other definitions for and so forth that I've seen before include "Et cetera" , "implies others of the same type" , "imagine what follows" , "etc." , "Along with other things" .)