Patients with large apical foramina are not candidates for apical surgery. Apical surgery is mainly to scrape the periapical lesion tissue and remove the infected root tip to promote healing of the periapical lesion. With a large apical foramen, the closure and integrity of the root canal is more severely disrupted, and if the end of the canal is not filled tightly, bacteria can enter the tooth through the fracture and cause retrograde infection. Repeated episodes of inflammation can lead to swelling of the gums, formation of fistulas, resorption of the alveolar bone, and cause tooth loosening, among other things. Root tip surgery also grinds away part of the alveolar bone, if the bone is slow to heal, and if it is not repaired in time, it will affect the stability of the tooth, and may lead to root fracture when chewing food. If you want to do apical surgery, it is best to go to a regular hospital in time, which will be safer and conducive to recovery.