The new teeth have already erupted without the milk teeth falling out, and most of the new teeth will be reset after the milk teeth are extracted in time.
Retained milk teeth are a common phenomenon in children during tooth replacement. When the milk teeth have not been lost and the permanent teeth have erupted lingually, it is mostly seen in children who have a fine diet and do not have sufficient chewing stimulation, and the roots of the milk teeth have not been absorbed. Alternatively, when the permanent teeth are erupting, they deviate from the normal eruption path, and the milk teeth do not fall out automatically, resulting in the phenomenon of double-layered teeth.
Most of the permanent teeth will return to their normal position after the milk teeth are removed in time. If the milk teeth are removed late, the permanent teeth have already stabilized in their new positions and it is difficult to return to their normal positions.
Therefore, retained milk teeth need to be extracted in time, and permanent teeth can return to their normal position on their own, or else they will become misaligned.