It has come on Mei-Shun’s molar of the lower right jaw. Yes, on the right. Actually, she had her left jaw swollen by narcotic injection in June. She therefore had her right molar shaven instead of left last month — no nerve, no pain for this one since it decayed seriously 2 decades before. It is regretful that she did not take good care of her teeth in younger days. They say Streptococcus mutans infect in babyhood, yet such finding is based on accumulated sacrifice by millions of patients.