My son-in-law is a dentist and so is my granddaughter. She recently got a grant of Rs. 10,000 to improve her design for a special Coronavirus face-mask. She is doing her Masters, and for me proudly, has stood first in her first year. What about teeth which will never deteriorate? No dentist required. Why would 'greater good' in the first instant would not be the best of all possible worlds?