He got motivated by his career oriented brother that was probably a first turning point of his life when he started considering seriously about schooling. Here, he met a family friend Tom, senior by 11 years, a good teacher to Greene. Under Tom’s course Greene read medicine and through 4 years 1853 56, he gained enough potential in anatomy and medicine. Tom and Greene remained close and lifetime chums . As we know prevention is healthier than cure, a case in point from 1891 when Black announced an idea to keep away from recurrence of dental caries by publishing his idea ‘EXTENSION FOR PREVENTION’ in an editorial in Dental Cosmos. This was to obtain self cleansing benefit to steer clear of food lodgment In Northwestern University once Dr.