Which of the following is a common symptom of a periodontal abscess?

A common symptom of a periodontal abscess is swelling and pain. This condition arises due to the accumulation of pus in the periodontal tissues as a result of bacterial infection. The inflammation triggered by this infection leads to noticeable swelling in the affected area. Additionally, the presence of pus puts pressure on the surrounding tissues, causing significant discomfort or pain. Patients may also experience tenderness in the area when they touch or apply pressure to the gums.

The other options do not align with the typical symptoms associated with a periodontal abscess. Improved chewing ability would generally not be expected, as the pain and swelling often hinder function. Decreased sensation in the gums is not a common characteristic of periodontal abscesses; in fact, increased sensitivity is often reported. Finally, brightening of teeth color does not occur as a result of a periodontal abscess, as this condition is usually characterized by more severe issues related to periodontal health rather than cosmetic changes.