The large teeth contain the wisdom teeth, which are the last of the large teeth. There are two sets of teeth in a person’s life, one set of milk teeth and one set of permanent teeth, of which the permanent teeth erupt around the age of 6. When the second molar erupts around the age of 13, the eruption can be considered complete, with a total of 28 teeth, and when they are 17~21 years old, the third molar (wisdom tooth) erupts, and some of them are congenitally missing, so that there are 28~32 teeth in the normal population. The teeth in the mouth are symmetrical from top to bottom, left to right, 7~8 teeth on each side, starting from the center are mesial incisors, lateral incisors, cuspids, first premolar, second premolar, first molar, second molar, third molar, and the last 3 teeth are usually collectively known as the big teeth, so the big teeth contain wisdom teeth. Patients with an abnormal number of teeth are advised to go to the dental department of a regular hospital for consultation. In addition, removal of retained wisdom teeth is usually recommended.