Assertion: mouthpiece | /r/CapableOf | cover the teeth
Facets:
value: to prevent injury
type: PURPOSE
Source sentences:
text: A mouthguard is a protective device for the mouth that covers the teeth and gums to prevent and reduce injury to the teeth, arches, lips and gums.
text: The mouth, normally moist, is lined with a mucous membrane, and contains the teeth.