Toothpaste With Color
Some toothpastes contain bluish dyes, to create an optical effect of dissimulation of the yellowish color. Although of course the effect is very labile.
Other toothpastes, manage to stimulate the pink color of the gum, so with the contrast of the tooth seems to be whiter, to go using the paste is acquiring the pinkest color.
It is a little effect that makes a red lipstick in contrast to the teeth
Some home remedies
The bicarbonate is one of the most used products at home teeth whitening, is clearly an abrasive method, lemon juice is often added both to compensate for the basic pH of the bicarbonate to dissolve some spots acidity. It is not advisable to do it very often as it can erode the enamel.
Rinse the mouth with hydrogen peroxide, lowering it with normal water, it will also help to whiten the teeth, although it is necessary to watch since this method can provoke the irritation of the gums.
Biting fruit, fresh as apples, can help to eliminate tartar and consequently eliminate the external stains of the teeth.