4. Fever
Many infections if left untreated or if allowed to get out of control can lead to fever. An elevated body temperature indicates that the body is battling microbes with white blood cells. In many cases, a low-grade fever can be tolerated without cause for alarm, but it should be watched. If a fever rises too high, it can be a sign of danger.
If you have a fever, you should seek medical attention immediately, because the infection could spread to the neck or the brain and develop into sepsis, which could be deadly. In addition, complications can develop, such as meningitis which may require hospitalization and long recovery time.
This is one reason why a dental abscess requires immediate attention by a dentist and the abscess should be drained of pus before a fever develops. Since infections can spread readily from the jaw to the brain, a fever is a reason to be concerned.