Dental cysts are diseases caused by chronic inflammation and are not very serious. With chronic periapical inflammatory secretions in the root of the tooth constantly destroys the alveolar bone, the surrounding epithelial tissue begins to encapsulate and form granulomas or cysts, and the affected tooth develops soreness and weakness in chewing. When the cyst progresses rapidly and becomes large, ping-pong-like changes occur in the jawbone, the bone cortex becomes thin and there is a risk of fracture. Tooth-containing cysts may form during the development of the tooth, sometimes compressing the nerve and causing facial numbness, requiring surgery to remove the cyst along with the cyst wall and, if necessary, extract the affected tooth to avoid recurring cysts.