Oral mucosa can heal on its own. Just like a wound on the human skin can heal naturally after a period of time, what needs to be noted is what exactly causes the shedding of the oral mucosa. The common mouth ulcer is also a condition in which the surface mucosa of the mouth is shed. Common recurrent oral ulcers are smaller called recurrent aphthous ulcers, ulcers are generally about 2-3mm in diameter, ulcers in about 1-2 weeks will gradually heal, will not leave any scar. There is another kind of oral mucous membrane shedding which is a larger oral ulcer called periorbital canker sore, the oral ulcer usually takes 4 weeks or more to heal and may leave a scar. Therefore, most cases of oral mucosa peeling can heal on their own, but it is necessary to investigate what causes the peeling of oral mucosa and make the right treatment.