Which of the following is not typically a symptom indicating a possible dental abscess?

A sudden improvement in oral health is not typically a symptom indicating a possible dental abscess. In fact, an abscess is an infection that often leads to worsening symptoms, such as pain, swelling, and bad breath, rather than an improvement.

When considering the other choices, swelling of the gums is a common symptom of a dental abscess as it reflects irritation and inflammation in the affected area due to infection. Sensitivity to cold stimuli can also be related to an abscess, as the infection may affect the nerves or cause exposure of the tooth's interior, leading to heightened sensitivity. Persistent bad breath is a frequent symptom of a dental abscess due to the presence of pus and bacteria associated with the infection. Such manifestations make it clear that a dental abscess is more likely to lead to discomfort and oral health decline rather than improvement.