Abstract
Successful root canal treatment relies on correct access cavity preparation, sufficient cleaning, adequate shaping, and complete obturation. Prior to these, location of all existing canals in the tooth plays an important part in the initial treatment procedures. While most teeth have a normal morphology, we should recognize that variations do exist. Normal maxillary second premolars have one or two root canals. Maxillary second premolars are less likely to have three canals. To date, only a few cases of maxillary second premolars with three roots (and three canals) have been reported in the literature. This case presentation reports a 20-year-old female who had three root canals in a maxillary second premolar, which underwent endodontic treatment at a teaching hospital in Taiwan.