Some patients with lip ectropion can self-correct, while some patients need to be treated, as follows: First, self-correction: If the lip ectropion is caused by insufficient strength of the perioral muscles, resistance training can be performed by clamping paper pieces on the upper and lower lips to improve the strength and intensity of the lip muscles, so as to correct the lip ectropion. Second, treatment is needed: If the lip ectropion is caused by abnormal development of the maxilla or mandible, treatment is needed to correct it. Generally, orthodontics needs to be considered so that the dental deformity can be improved before the lip ectropion symptoms can be relieved. Therefore, whether the lip ectropion can be self-corrected needs to be determined according to the etiology. Early diagnosis and early treatment can lead to significant relief of clinical symptoms, and adult patients can also get significant improvement after active treatment.