The patient's slightly curved mouth should be considered to be caused by two diseases. The first is cerebrovascular disease, and the second is peripheral facial neuritis. No matter what the situation is, you must go to the neurology department of the hospital in time, carry out corresponding examinations, and then determine the treatment plan. If it is considered that the mouth is slightly crooked due to cerebrovascular diseases, the patient may have symptoms such as tongue extension deviation or language clumsiness, poor limb movement, and numbness of limbs. The patient should go to the hospital for head CT examination to determine whether it is caused by cerebral hemorrhage or cerebral infarction, and then give positive treatment. There is also peripheral facial neuritis. Patients with facial nerve damage due to colds or virus infection will have facial paralysis, and their mouth will tilt to the healthy side, accompanied by such symptoms as puffy cheek air leakage, shallower nasolabial groove, and shallower forehead lines.