Disclosed herein is a tooth whitener using glycerol monooleate. The toothwhitener is a composition that exhibits teeth whitening effects when beingapplied to teeth. Specifically, the tooth whitener comprises a glycerolmonooleate, a polyol, a polymer, a peroxide and a hydrophilic solvent, and hasa W/O emulsion phase. The tooth whitener is flowable before being applied toteeth and is spreadable when being applied to teeth. In addition, the toothwhitener is solidified by the action of moisture, such as saliva, after beingapplied to teeth, and can thus be adhered and fixed to the teeth. Furthermore,changes in viscosity of the tooth whitener with varying temperature can beminimized and the release rate of the whitening ingredient can be controlledby the addition of polyol.
