Dental Treatment in progress

Dental treatment on lower right 1st molar yesterday was removing bad nerve tissue from the root canal, because of unfavorable anesthetic effect, only mesial buccal and mesial lingual roots were processed, so still now have I strange dull pain on the portion including injection stylus needle injury.
Though I say that the direct anesthetic technique to Mandible nerve hole is acceptable, he hesitates to do that because of the accident such as paralysis.
Anyway, all the treatment should be over ASAP.
Deep consideration about an unendurable pain in the tooth obliged me to think over about the relation between the living thing and bacteria living everywhere.
Our body is fighting with so to speak bacterial infection all the time, almost of the time we could win, but in case we were defeated by them, we would die.
Epithelium tissue fully covering our body is an indispensable armor suits to prevent the bacterial infection, but remember the transition section to hard tissues like hair, nail and tooth are the weakest points for infectious diseases, especially when our body condition is not favorable.
Antibiotics we can receive is the Gospel for infectious diseases that attack on the bacterial directly.
The invention of this special medicine is one of the main reason of long life and aged society.