Assertion: whitening's teeth | /r/HasProperty | extrinsic stain
Facets:
Source sentences:
text: For over 50 years, treating mottled teeth, an extrinsic stain, was the ultimate goal.
text: Teeth whitening works by actually changing the color of the inside of the teeth (known as intrinsic whitening), or removing stains from the outside of the teeth (known as extrinsic whitening).
text: Teeth whitening works by actually changing the color of the inside of the teeth (known as intrinsic whitening), or removing stains from the outside of the teeth (known as extrinsic whitening).