Whitening Toothpaste

Research shows many different things. But toothpaste by itself cannot do sufficient whitening where you get long lasting results. It can be abrasive and is like scratching off a thin layer of your enamel which can be seen at the moment as some degree of whitening. So I wouldn't call it true whitening. Another thing to note is the thinner your enamel gets the yellower your teeth will be since the inner layer 'dentin' of the tooth will show through more, and dentin is yellow in color.