Dental infections and abscess need to be treated right away. Poison from the dental infection can cause death if left untreated and it spreads throughout your body. Just how dangerous a dental abscess is will depend on how soon a person seeks treatment. if If a person waits until the gum is so swollen that they have difficulty breathing or opening their mouth, the situation is very serious. If the abscess is causing you dental pain you also need to see a dentist ASAP. It is never a good idea to delay dental care when deal with a dental infection.