Kwak Y, Choi J, Kim K, et al. - In the current population-based study, researchers evaluated the 5-year survival rate of teeth receiving endodontic nonsurgical treatment. In particular, the variables that affect endodontically treated teeth's 5-year survival rates were analyzed. For this investigation, they incorporated all endodontically treated teeth reported in 2010 in the National Health Insurance Cohort database of the Republic of Korea. The 5-year survival rates of the initial root canal treatment (RCT) and re-RCT were examined by tracing the dental records of the sample to the end of 2015. In total 2,866,749 teeth were receiving initial RCT and 173,429 teeth were receiving re-RCT. Data reported that 5-year survival rates were 90.85% and 88.42%, respectively. Teeth survival rates receiving initial RCT were significantly higher than those receiving re-RCT. In particular, within 12 months, re-RCT showed a considerably greater rate of extraction than during other intervals. In addition, the following features substantially impacted the 5-year tooth survival rate: being female, < 20 years of age, hospital as the institution type, mandibular teeth, anterior teeth, initial RCT, and use of rubber dam. Overall, the authors concluded that endodontic treatment is an effective method of maintaining natural teeth due to its high 5-year survival rate.