Dental abscesses are commonly seen in individuals with poor oral hygiene and improper care. Tooth infection is the stepping stone to a dental abscess, which in course of time results in an infection of the throat, mouth and cheeks. Dental abscesses occur when a small area of tissue becomes infected and the body is able to "wall off" the infection and keep it from spreading. White blood cells, the body's defense against some types of infection, migrate through the walls of the blood vessels in the area of the infection and collect within the damaged tissue.
Dental abscess is formation of pus on the tip of the tooth. The main cause of this infection is always a bacterium.
Bacteria are very small organisms not visible by naked eye. Every person has bacteria in his/her mouth. Bacteria may also enter after an injury to the tooth, such as when a tooth is broken or chipped. Poor oral hygiene or a weak immune system may increase your risk of having a dental abscess.
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Infection results in a collection of pus (dead tissue, live and dead bacteria, white blood cells) and swelling of the tissues within the tooth. This causes a painful toothache . Infection may spread out from the root of the tooth and to the bones supporting the tooth. 
Treatment for dental abscess may also have unpleasant side effects. You may have itching, nausea (upset stomach), vomiting (throwing up), or diarrhea (loose bowel movement). Treatment is not usually curative, but help is still available. Most patients obtain relief through one or a combination of medications that either simmer down the extra nerve-impulses or reduce the effects of the barrage of extra signals that arrive in the brain. Treatment for dental abscess may also have unpleasant side effects. You may have itching, nausea (upset stomach), vomiting (throwing up), or diarrhea (loose bowel movement).
Medications such as acetaminophen (Tylenol) reduce fever (if any) and pain. Anti-inflammatory medicines such as ibuprofen (Motrin and Advil) aid in reducing fever and also help reduce swelling and inflammation in the tissue. Medical dental abscess is familiar. It can be complication of tooth decay (caries) or from an infection in the gums develop. Medical information changes rapidly and while we make efforts to update the content on the site, some information may be out of date. Use of information on this website is subject to the disclaimer and the terms and conditions.
Dentists usually treat this kind of abscess by first draining the infection, then thoroughly cleaning the area. The dentist then smoothes out the root surfaces of the tooth to promote healing and to help keep the infection from recurring. Dentists usually use scaling and root . 
Root canal therapy can get rid of the infection and save the tooth in most cases. In root canal therapy, the infected tissue in the central part of the tooth pulp is removed. Root canal therapy may be recommended in an attempt to preserve the tooth. The center of the tooth, including the nerve and vascular tissue (pulp), is removed along with decayed portions of the tooth.
Pus collects in a pocket that forms in the bone at the end of the root. An abscess almost always begins in the central or pulp area of the tooth and spreads into the surrounding bone. Pus forms in the crevices between the tooth and the gums caused by periodontitis. The technical name is periodontal abscess.