Assertion: tooth whitening | /r/HasProperty | achieved
Facets:
value: by changing the intrinsic colour
type: MANNER
value: by wearing a fitted tray
type: MANNER
Source sentences:
text: Tooth whitening can be achieved by either changing the intrinsic colour or by removing and controlling the formation of extrinsic stains.
text: Tray-based tooth whitening is achieved by wearing a fitted tray containing carbamide peroxide bleaching gel overnight or for two to four hours a day.
text: Tooth whitening can be achieved by either changing the intrinsic colour or by removing and controlling the formation of extrinsic stains.
text: Tray-based tooth whitening is achieved by wearing a fitted tray containing carbamide peroxide bleaching gel overnight or for two to four hours a day.
text: Reading the introduction: "Tooth whitening can be achieved by either changing the intrinsic colour or by removing and controlling the formation of extrinsic stains" would lead a reader to believe teeth whitening can remove all types of stains.