There are many causes of irregular teeth, such as genetic factors, multiple teeth, milk and permanent teeth replacement obstacles, etc. Different methods are chosen according to the symptoms. 1. Hereditary factors: As one of the two parents has uneven teeth, it may be passed on to the next generation. It is recommended to pay more attention to the children’s teeth during their growth, and go to the dental hospital for examination in time, so as to avoid affecting the children’s masticatory function and appearance form. 2. Multiple teeth: Due to developmental defects, excessive splitting of permanent tooth embryo, excessive tooth buds, etc., multiple teeth can be formed. Extra teeth grow out of the tooth area, resulting in malocclusion, crowded teeth, irregularities, etc. It is recommended to extract the teeth, and then correct the problem with orthodontic appliances, such as ordinary steel braces, invisible braces, self-ligating braces, etc., which can be effective in relieving the problem. 3. Breast and permanent teeth replacement obstacle: Due to the replacement of permanent teeth, the milk teeth are not detached in time, retained in the alveolar bone, and then the permanent teeth will be misplaced, resulting in crowding and the teeth next to it, it is recommended to extract the milk teeth, so that the permanent teeth to return to normal growth. It is recommended to go to the dental hospital in time to check this symptom and cooperate with the treatment.