Double row of teeth mainly refers to the juxtaposition of the baby teeth and permanent teeth growing on the jawbone and alveolar ridge, which leads to the permanent teeth deviating from the dental arch. The correction methods are as follows: 1. go to the hospital as early as possible to remove the baby teeth, so that the permanent teeth grow back to the alveolar ridge; 2. if the baby teeth lose early, need early treatment, can be installed gap retainer; 3. keep the oral cavity clean by brushing teeth to prevent dental caries, if it develops into rotten teeth, need to go to the hospital as soon as possible to fill the teeth; 4. if the rotten teeth are too serious, such as inflammation, pus phenomenon, then need to extract the teeth.