The tooth with apical infection can be extracted. For dentists, especially oral surgeons, all teeth in the oral cavity can be extracted, but only if there is an indication for extraction, and apical infection is not an indication for extraction, and it is obviously inappropriate to extract the whole tooth just because of apical infection. Because apical infection is a very common disease that causes toothache in clinical practice, it is mostly caused by the further development of dental caries, which develops into pulpitis and finally into periapical infection. In case of periapical periodontitis, the tooth can be drained, extracted and systematically treated with root canal therapy to make the tooth painless. However, this tooth is no longer nourished by the pulp, and it is still necessary to protect this tooth by means of crown restoration, which will still serve the patient for a very long time most of the time without the need of extracting this tooth.