Which of the following does NOT represent a possible complication during a root canal procedure?

During a root canal procedure, various complications can arise due to the complex nature of the tooth's canal system and the procedure itself. Blocked canals, infection, and excessive bleeding are all recognized complications that can adversely affect the outcome of the treatment.

Blocked canals occur when debris, calcifications, or other obstructions hinder the cleaning and shaping of the canal, making it challenging to properly remove the infected or necrotic tissue. Infection can be a risk, as bacteria can remain or exacerbate the condition, leading to persistent symptoms even after treatment. Excessive bleeding may occur if the procedure inadvertently involves the surrounding tissues or vessels, complicating the procedure and requiring additional measures to control the bleeding.

In contrast, having a clear canal system is not a complication but rather an ideal scenario during a root canal procedure. A clear canal allows for effective cleaning and shaping prior to filling, leading to a successful resolution of the infection and proper sealing of the tooth. Thus, identifying a clear canal system as a complication is incorrect.