Crooked mouth after submaxillary gland surgery usually takes about 3 months to return to normal. Crooked mouth after submaxillary gland surgery is often caused by nerves, which is roughly categorized into nerve irritation and nerve damage, as follows. 1. Nerve irritation: If the nerve is irritated during the operation, the crookedness of the mouth after the operation will be more obvious when you are moving around, which is less serious, and the recovery will be faster. 2. Nerve damage: If the nerve is damaged during the operation, the mouth will be crooked in the resting state after the operation, which is more serious than the nerve stimulation mentioned above, and the recovery time is relatively longer. If the mouth is seriously distorted after submaxillary gland surgery, or if there is a delay in improvement, it is recommended to go to the hospital in time to clarify the cause of the distortion and then carry out targeted treatment.