Double rows of teeth need to determine the type of double rows of teeth, may be caused by retained milk teeth, multiple teeth or crowding, etc., different types of treatment varies. 1. If the double rows of teeth are caused by retained milk teeth, it is recommended to extract the retained milk teeth, usually the inherited permanent teeth can be moved to the normal position on their own, and orthodontic treatment can be done if the teeth are not aligned in the later stage. 2. If the double rows of teeth are caused by supernumerary teeth, it is recommended to extract the supernumerary teeth, and the gap left behind, the patient can decide whether to observe or orthodontic treatment according to the requirements of aesthetics and so on. 3. If double rows of teeth are caused by overcrowding, the best solution is orthodontic treatment. It is recommended to go to the stomatology department of the regular hospital, and be examined by the physician to make a clear diagnosis according to the condition, and treat the symptoms.