It’s a movie in which Dustin Hoffman’s character unwittingly becomes a target of some bad guys who think he knows something. They use dentistry without anaesthesia as an interrogation method to get him to talk.
I made the reference as a joke about how in bonsai we use tools that look a lot like surgical tools to perform invasive procedures on trees which, in most cases, aren’t “medically necessary” from the tree’s perspective (if trees were sentient and could have an opinion) and which the tree did not consent to (because trees can’t give consent). If trees were capable of cognition, what we do to them would be “tree torture”.