The abscess or abscess is an accumulation of pus caused by bacterial infection of the root of a tooth. The origin of the abscess or phlegmon may be different: in a cavity, which causes an infection inside the tooth, the nerve root and even bone; or periodontal disease causes movement of the teeth. The most common symptoms that produce an abscess include pain in the affected area difficult chewing, tooth sensitivity, bitter taste, bad breath, fever and swollen glands in the neck, among others. Abscess treatment is antibiotics, anti-inflammatory and mouth rinses with warm water and salt. If this therapy does not work, the dentist will make an incision to treat the infected nerve and place a filling or a crown over the tooth to prevent fracturing.