clean as a hound's tooth vs ethical

clean as a hound's tooth

adj
  • Very clean; very innocent. 

ethical

adj
  • Morally approvable; good. 

  • Of or relating to the study of ethics. 

  • Of or relating to the accepted principles of right and wrong, especially those of some organization or profession. 

  • Only dispensed on the prescription of a physician. 

noun
  • An ethical drug, one only dispensed on the prescription of a physician. 

How often have the words clean as a hound's tooth and ethical occurred in a corpus of books? (source: Google Ngram Viewer )