The passage discusses the nature and characteristics of pain in dental pulp, particularly focusing on the irritation caused by irritant anesthetics or germicidal drugs. It also explores the role of instinct and habit in human behavior, emphasizing how these factors influence professional recognition and personal identity. The text then delves into the identification of dentists based on their demeanor, habits, and specific qualities such as sympathy and knowledge of dental procedures. Finally, it mentions the use of sulfuric acid in root canal treatment, highlighting the author's success and the conditions under which it is effective.The passage discusses the nature and characteristics of pain in dental pulp, particularly focusing on the irritation caused by irritant anesthetics or germicidal drugs. It also explores the role of instinct and habit in human behavior, emphasizing how these factors influence professional recognition and personal identity. The text then delves into the identification of dentists based on their demeanor, habits, and specific qualities such as sympathy and knowledge of dental procedures. Finally, it mentions the use of sulfuric acid in root canal treatment, highlighting the author's success and the conditions under which it is effective.