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
When undertaking bleaching of vital teeth of the
following are done except: 
Select and explain. 
A. Prophylaxis, B. Use of protective eye glasses, C. Use of local anaesthesia, D. Polishing after treatment
C: Use of local anaesthesia
Answer: C: Use of local anaesthesia 
Explanation: None