The white mucous membrane in the mouth when waking up in the morning is because during a night’s sleep, there is basically no physiological activity in the mouth, and the mucous membrane on the buccal side and the tongue are completely attached to the surface of the teeth. If the patient is too nervous, or if he or she is too obese, there is a possibility that some meat or muscle on the tongue will be inside the teeth. After a night like this, certain traces will be formed the next day, which is all very normal performance and the patient should not worry too much. Usually the white mucous membrane will naturally get better about 1-2 hours after waking up. If the patient is under prolonged mental stress, it is also likely to cause the buccal mucosa to break down, and at such time, you need to visit the hospital. Let the doctor grind away the thin-walled weak tip in your mouth to avoid the sharp part, which scrapes the tongue or buccal mucosa and causes certain irritation.