With the improvement of living standards, the nation is paying more and more attention to dental care. More and more primary and secondary school students are having regular dental checkups and choosing orthodontic treatment, and more and more children are finding that their incisors are not erupting properly or are erupting abnormally, and further radiographs are being taken to find multiple teeth. Or the orthodontic radiographs may reveal the presence of multiple teeth. So what kind of teeth are multiple teeth? A multifocal tooth, also known as an extra tooth, is a tooth that grows in addition to the normal number of permanent teeth. In other words, in addition to the 20 milk teeth and 32 permanent teeth, the teeth that grow in addition to the whole mouth, the incidence of multiple teeth in the population of permanent teeth is 1% to 3%. The number of teeth is mostly 1 to 2, and there may be more than one in individual patients. One of the author’s patients had as many as 12 multiple teeth. The shape of multiple teeth is mostly cylindrical or conical, but there are also those that resemble normal teeth. They can occur anywhere in the dental arch, but most are located between the incisors or on their palatal side. Some of them erupt before the upper central incisors, thus affecting the normal eruption and alignment of permanent teeth. Multiple teeth in the upper central incisor area often erupt between the central incisors or on the palatal side, causing problems such as failure of the anterior teeth to erupt, crowding of the anterior teeth, malocclusion of the upper central incisors toward the lip, or a wide gap between the central incisors. So what should we do when we find multiple teeth? Multiple teeth should be detected and treated as early as possible. Generally speaking, multiple teeth that can erupt into the oral cavity can be seen with the naked eye, while multiple teeth that do not erupt in the jawbone need to be detected by X-ray or even CT examination, so regular examination of baby teeth has a considerable role, for multiple teeth can be found early and timely extraction will reduce the impact on the permanent dentition. The roots of multiple teeth are usually shorter than the roots of normal permanent teeth, and development is completed earlier. The presence of multiple teeth during the mixed dentition period often causes difficulty in eruption or displacement of permanent teeth and should be extracted in a timely manner. If the multiple teeth are buried in the jawbone and the child is young and the teeth are in the formation stage, the surgical extraction may injure the permanent tooth germ, so the extraction can be postponed and further observation should be made until the permanent tooth root development is completed. The extraction can be guided by 3D CT in order to determine the number and location of supernumerary teeth, and the buried supernumerary teeth can be temporarily left untreated if they do not produce any pathological changes and do not hinder the eruption of normal teeth. However, if the teeth grow outside of the normal teeth, they must be extracted, and the sooner they are extracted, the better! The following is a special explanation of several issues of concern to the family: 1. When is the best time to extract the extra teeth found? The age at which multiple teeth are found varies, with permanent teeth generally starting to erupt after the age of six and incisors generally erupting at the age of seven or eight. It is recommended to extract the extra teeth that affect the eruption of permanent teeth before the age of six. Except for those with a higher possibility of damaging permanent teeth, it is recommended to extract them as soon as possible. It is recommended to extract the teeth that do not affect the eruption of permanent teeth after the eruption of permanent teeth. The specific timing of extraction should be based on the diagnosis of the attending doctor! 2. Will general anesthesia for tooth extraction affect the child’s intelligence and brain? Please rest assured that the current anesthetic will not cause any damage to the child’s brain. However, if you operate under general anesthesia, you will face the problem of surgical risks, which the surgeon will talk to you in detail. The author generally recommends that children be operated under local anesthesia, and the youngest of my patients who have been successfully operated under local anesthesia is four and a half years old. Of the hundreds of patients with multiple dentition, basically ninety-eight percent of them are treated in the outpatient clinic. Only one of the dozens of children in the first three quarters of 2015 had to be hospitalized under general anesthesia because of crying and refusal to cooperate. All of the children were successfully extracted with minimally invasive extraction of multiple teeth. 3. Is the surgery very invasive and how long does it take? The only time a child feels pain in the outpatient clinic is when the anesthetic is injected, and this becomes the key to whether the operation can be performed in the outpatient clinic. Generally, children can be treated quietly after anesthesia, and the surgery is minimally invasive. The incision is about 1.5cm or less, and will not use hammering and other violent action, the time can be controlled within ten minutes, even if more than two multi-grown teeth generally will not exceed 15 minutes. 4.Do I need to be hospitalized for observation after surgery, do I need to give injections, and what about the removal of sutures? I outpatients that can be done as you go, you can go home after surgery. No need to be hospitalized for observation. Because it is a minimally invasive operation, generally take three days of antibiotics can be, for poor body resistance, or the location of multiple teeth particularly deep patients, you can short-term infusion to prevent infection. Normal sutures can be removed after ten days, and absorbable sutures usually do not need to be removed, if you feel a foreign body feeling after ten days, you can also remove them.