caries vs gangrene

caries

noun
  • The progressive destruction of bone or tooth by decay 

gangrene

noun
  • The necrosis or rotting of flesh, usually caused by lack of blood supply. 

  • A damaging or corrupting influence. 

verb
  • To produce gangrene in. 

  • To be affected with gangrene. 

  • To corrupt; To cause to become degenerate. 

How often have the words caries and gangrene occurred in a corpus of books? (source: Google Ngram Viewer )