The clinical symptoms are mainly the inability of the tongue to lift up and lick the upper dental bed and hard palate, or the inability of the tongue tip to extend completely out of the mouth in an M-shape when extending the tongue. In some children, the tongue ligament is too short and may cause lingual ulcers due to prolonged friction between the lower front teeth and the lingual ligament during feeding and sucking. It is commonly believed that a short lingual ligament may lead to poor phonological development, with children pronouncing “L” scales and other phonetic sounds in a non-standard manner. The best treatment for short tongue ligament is lingual ligament lengthening, which can completely solve the problem of short tongue ligament and achieve normal pronunciation with postoperative speech training.