It is the same as “riser’s tooth”. It is the innermost large teeth, one on each side of the upper and lower, the scientific name of the third molar. Because these four third molars begin to erupt at the age of about 20, when the physical and psychological development of people is close to maturity, they are regarded as a symbol of the arrival of wisdom, so they are called “wisdom teeth”. The location of wisdom teeth starts from the incisors, and if there is an eighth tooth, it is a wisdom tooth. The growth of wisdom teeth varies greatly from person to person. Some people have wisdom teeth before the age of 20, some people have wisdom teeth at the age of 40 or 50, and some people do not have wisdom teeth for life. Some people may have only one or two wisdom teeth. These are all normal. Some wisdom teeth do not come out or do not come out completely, the medical term is wisdom teeth obstruction. The wisdom teeth that do not come out or do not come out completely are called “blocked teeth”. The main reason for wisdom teeth obstruction is the gradual degeneration of the human jawbone, some people lack sufficient space for all the teeth; then there are minors who have delayed the development of the jawbone during puberty, there is no appropriate location for wisdom teeth to erupt. This is when the wisdom teeth are blocked in the jawbone and grow in other directions. Obstructed teeth may lead to certain dental and even oral diseases. Due to their special location, wisdom teeth cause a lot of inconvenience for their own cleaning and treatment of dental diseases, and in many cases they have to be removed to avoid health hazards. The wisdom teeth should be extracted if they cause lesions in neighboring teeth, or if they cause odontogenic cysts or jaw and facial infections. 3. To avoid problems during pregnancy. Not all wisdom teeth need to be extracted. What kind of wisdom teeth are worth preserving? 1. Wisdom teeth are healthy and useful. Wisdom teeth that erupt normally and have a chewing function are beneficial and should be retained. 2) Wisdom teeth that are completely buried in the bone, do not interfere with neighboring teeth, do not cause nerve pain due to pressure on the nerve, and are safe and sound can be retained temporarily. 3) Wisdom teeth that may cause loosening of neighboring teeth if they are extracted can be retained for the time being. 4) Wisdom teeth that can be used as abutment teeth to avoid missing free ends; wisdom teeth that are needed for orthodontic treatment in children aged 8-10 years old can be retained for the time being. The wisdom teeth can be temporarily removed. As to whether your teeth need to be retained, a professional doctor needs to make a diagnosis based on the actual situation.