Facial nerve palsy is mostly caused by ischemia and edema of the facial nerve due to infection and other reasons, resulting in facial muscle paralysis symptoms, such as crooked mouth, loss of forehead lines, inability to frown, incomplete eyelid closure, and breathless speech. The recovery time for facial nerve palsy caused by a crooked mouth varies depending on the patient’s physical condition, the degree of the disease, and the treatment modality. In general, patients with incomplete facial palsy at the beginning of facial nerve palsy may recover within 1-2 months with effective treatment. However, if the facial nerve palsy is more severe and not effectively controlled, it will take 2-8 months or even 1 year to recover, and there may be sequelae that prevent the patient from fully recovering to the original state. The recovery from facial nerve palsy caused by a crooked mouth also has a certain relationship with the patient’s physical condition. Younger patients usually recover better and faster, while older patients or patients with diabetes, hypertension, atherosclerosis, myocardial infarction and other diseases usually recover more slowly and have a poorer prognosis, and may have sequelae. In addition, active treatment can also contribute to the recovery from facial nerve palsy, such as the use of nerve-nourishing drugs such as B vitamins or, if accompanied by infection, anti-infective drugs such as acyclovir. Patients can also choose hot compresses, acupuncture, and infrared radiation to promote the recovery of crooked mouth symptoms.