The main symptoms are painful swelling of the soft tissues around the crown of the tooth, and if the inflammation affects the bite muscle, it can cause different degrees of mouth opening restriction, and if it affects the pharyngeal side, it can cause difficulty in swallowing, resulting in difficulty in chewing and swallowing. Due to the increasing refinement of human food, the jaw bone gradually degenerates and shrinks, resulting in a disproportion between the length of the teeth and the jaw bone. Wisdom teeth are the last teeth to erupt in the dental row, mostly at the age of 18 to 25 years old, due to insufficient eruption position, resulting in incomplete eruption of wisdom teeth and ectopic or obstructed, the crown part of the tooth leaks outside the gum part covered by the gum, the gum and the tooth body to form a narrow deep blind pocket, easy to accumulate food residues and bacteria, general brushing and rinsing difficult to clean, coupled with the crown part of the gum due to chewing food and damage to form ulcers When the systemic resistance decreases and bacterial virulence increases, it can cause inflammation of the tissue around the crown.