Which of the following is a sign that may indicate a dental emergency?

A sudden severe toothache or injury is a clear indicator of a dental emergency because it often signifies an underlying issue that requires immediate attention. Severe pain can be a result of various conditions, such as an abscess, fractured tooth, or significant trauma, all of which can lead to further complications if not addressed promptly. Additionally, an injury, especially to the teeth or jaw, can lead to more severe damage if not treated in a timely manner. In such situations, immediate assessment and intervention by a dental professional are crucial to manage pain, prevent infection, and save teeth.

In contrast, minor tooth sensitivity typically does not necessitate urgent care and can often be managed with over-the-counter remedies or adjustments in dental hygiene. Discomfort from braces, while potentially unpleasant, is generally expected as teeth shift and adjust and does not indicate a critical situation. Lengthy dental procedures, while they may lead to fatigue or temporary discomfort, do not usually represent a dental emergency unless accompanied by significant pain or complications during treatment.