Whitening toothpastes & mouth rinses are not very effective
Unfortunately for the people looking for a quick and easy whitening treatment, whitening toothpastes and mouth rinses are not very effective. In order to whiten teeth, the "contact time" between the tooth and the whitening agent is critical. Simply brushing or rinsing teeth, even if for a few minutes, is not enough to achieve results.
If you were trying to bleach a dark shirt, you need to soak the shirt in bleach for a relatively long time.
In a similar...