Incisal canal cysts, or nasopalatine cysts, if left untreated, continue to enlarge and may cause protrusion of the upper lip, pathologic resorption of the jawbone, and pulpal necrosis of adjacent teeth. Nasopalatine cysts are non-odontogenic tumors formed in or near the incisal canal after epithelial hyperplasia of the incisal canal remnants. Cyst curettage is needed after X-ray diagnosis, if left untreated, the cysts will gradually increase in size and break through the bony wall, causing loss of bony bone on the labial or palatine side, and protrusion of the upper lip that affects the aesthetics. In addition, the cyst will continue to increase in size and compress the peripheral middle incisors, affecting their blood flow and causing pulp necrosis; in severe cases, it may spread to the palatal plate and to the nasal cavity. Nasopalatine cysts are often found unintentionally during radiographs, and there are no obvious symptoms in the early stage, so it is recommended to treat them as soon as possible to avoid delaying the condition.