This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
[{'content': 'Ozone can be used for All  the following except: \nSelect and explain. \nA. Disinfection of the root canal during root canal treatment, B. Sterilization  of  tooth  surfaces  before  making  fillings  or before inserting crowns or inlays, C. Prevention of dental caries, D. Internal  bleaching', 'role': 'user'}, {'content': 'Answer: C \nExplanation: As ozone is a great sterilization medium.\nIt is used for:\n\nDisinfection of the root canal during root canal treatment.\nSterilization of\xa0tooth\xa0surfaces\xa0before\xa0making\xa0fillings\xa0or before inserting crowns or inlays.\nDisinfection of dental unit\xa0 water\xa0 lines.\nVery\xa0fast\xa0internal\xa0bleaching.\nDesensitizing the crown preparations.\xa0\n\nThere is a currently only one device that has health and safety executive approval for the treatment of the dental caries in the mouth, and it is named as healozone.\nReference: International Journal of Oral Health and Medical Research | ISSN 2395-7387 | SEPTEMBER-OCTOBER 2015 | VOL 2 | ISSUE 391', 'role': 'assistant'}]