title: Letter to the editor: a case of unexplained gingivitis.
mesh_terms: D002403:Cathepsins / Q000627:therapeutic use*; D005260:Female; D005891:Gingivitis / Q000188:drug therapy*; D006801:Humans; D006851:Hydrochloric Acid / Q000627:therapeutic use*; D008875:Middle Aged; D010434:Pepsin A / Q000627:therapeutic use*
chemical_list: D002403:Cathepsins; D010434:Pepsin A; D006851:Hydrochloric Acid