Which of the following is NOT a potential post-operative complication?

Rapid healing of tissues is not a potential post-operative complication because rapid healing is generally considered a positive outcome following surgery. After periodontal surgical procedures, the expected healing process involves a series of physiological events that include inflammation, tissue formation, and remodeling. While the time frame for healing may vary among patients, if the tissues heal quickly, it typically indicates good biological response and successful surgical intervention.

In contrast, persistent bleeding after surgery is a common complication that can occur due to inadequate hemostasis during the procedure or underlying coagulopathy. Sensitivity to percussion is also a possible post-operative symptom that may arise from the trauma inflicted during surgery or from irritation of surrounding tissues. Additionally, a feeling of weakness could occur as a result of anxiety, pain, or a response to anesthesia after the procedure. Therefore, the other options represent potential post-operative complications, while rapid healing signifies an expected and encouraging result.