A Tooth Abscess or Dental Abscess is an accumulation of pus. There are a few reasons a dental abscess may occur, but most commonly it is resulting from a dental infection. It is not always visible in the mouth but can be seen on an x-ray. If untreated, this condition can cause extreme pain and swelling and can progress to a severe, life-threating infection. In this article, Dr. Rozelle Owens will explain how to treat a dental abscess and its causes and symptoms.