Apical cysts are one of the most common cystic lesions affecting the jaws. Apical cysts have no conscious symptoms and are therefore easily overlooked by the organism. The cause of apical cysts is usually a tooth that has suffered from deep caries, dead pulp teeth, etc. If the inflammation is not treated in time, the acute inflammation turns into chronic inflammation and cysts are formed in the long run. Patients with apical cysts will have pulp necrosis, tooth discoloration, lusterless, mostly dark gray; and the size of apical cysts varies from small ones as big as pea-like to large ones as big as ping-pong balls, and the elasticity will be obviously felt when the hand is used to touch and press. When the pulp loses its vitality, the tooth is discolored, there is a history of endodontic disease, and there is a bulge in the apical area it is recommended to go to the hospital in time for X-ray irradiation to check for the appearance of cysts around the roots of the teeth. The treatment for apical cysts is determined by the size of the cyst, and if it is small, apicoectomy and cyst scraping can be used. These two methods can save the affected tooth. However, large cysts must be surgically removed and the tooth should be extracted if it becomes loose. An apical cyst is a common cystic lesion that occurs in the apical tissue. Once the symptoms of apical cysts appear, it is recommended to go to the hospital promptly for examination and appropriate treatment plan.