Some patients, especially children and teenagers, have small teeth growing out of the middle of the incisors, usually occurring on the inside of both incisors, called multiple teeth Why do multiple teeth grow? The earliest stage of tooth development is when the embryo is 6 weeks old. If the number of dental buds formed by the overproliferation of the dental plate is more than the normal number, the fetus will grow more teeth during the development process after birth, and there are two kinds of “multiple teeth”: normal form and conical form, and the most common growth site is the multiple teeth between the two maxillary central incisors. The most common site of growth is between the two maxillary central incisors. The multiple teeth can occupy the position of the normal teeth in the dental arch and prevent the eruption of the normal teeth, forcing the erupted teeth to grow out from the side of the dentition and causing a disorder in the alignment of the dentition. The gap between them is easy to stuff food and cause gum inflammation or tooth decay. Therefore, there are disadvantages but not advantages of multiple teeth, but many multiple teeth are not noticed. Some parents regard it as a normal tooth. Some parents think it is an unlucky phenomenon. These views are not correct. Some of them may not erupt and need to be detected by taking pictures. If they are detected, they need to be extracted as soon as possible and do not need to wait until they erupt to avoid affecting the eruption and alignment of normal teeth.