Whether to extract a tooth affected by periodontitis depends on the condition of the periodontitis. In the early stages of periodontitis where there is no absorption of the alveolar bone, and the inflammation is limited to the gums, symptoms may include bleeding gums, red and swollen gums, or pus from the gums. In such cases, it is possible to preserve the tooth after basic treatment. This means that after cleaning the teeth and removing dental calculus, and applying medication to the gums to control inflammation, the tooth can be preserved. However, if the periodontitis is severe and there is significant absorption of the alveolar bone along with loose or falling teeth, it is difficult to preserve the teeth, and extraction may be necessary.