Under what circumstances do you extract teeth?

For example, if the patient has serious and extensive caries, which cannot be repaired by root canal treatment, it needs to be extracted, such as residual roots, such as residual crowns. If the patient has severe periapical lesions, it cannot be repaired by root canal treatment or apical resection, etc., this conservative treatment method to retain teeth needs to be extracted. If the patient has severe periodontal disease, most of the bone tissue around the teeth is destroyed, or the patient is limited and cannot be treated, we need to extract it. Or the patient is an impacted wisdom tooth, which is easy to cause adjacent teeth to decay or is often infected.