Assertion: mouth ulcer | /r/HasProperty | aphthous ulcers
Facets:
Source sentences:
text: Remember, not all mouth ulcers are aphthous ulcers.
text: Mouth ulcers, also known as oral ulcers, aphthous ulcers, or canker sores, are breaks in the tissue lining of your mouth, often along the base of the gums or inside the cheeks or lips, but can form in the floor of the mouth or on the tongue.