An extraction is simply the removal of a broken or decayed tooth from the socket in the bone. When too much damage prevents repair, the tooth must be removed.
Multiple tooth extractions are usually done for patients who have periodontal disease or extensive dental decay. In severe cases of periodontal disease, the teeth become loose because of the extensive bone loss surrounding the teeth. The gums stay inflamed and infected and continually trap food. This is not healthy. Removing hopeless teeth is a good thing because chronic dental infections can be the source of heart attacks, strokes and many other medical problems.