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Whitening tooth pastes are generally considered not very effective to actually whiten the teeth. They may be beneficial to remove some external stains but if the teeth are internally discoloured, they can only be improved by a prefessional who can prescribe home whitening or the whitening done in a dental surgery.
No such whitening toothpastes are their ,its only a marketing skill to market their product.Only a professional can work out in the clinic for whitening of teeth.
Limited effectiveness up to 60% if used regularly and respect conditions
whitening toothpaste wont enhance to color though they just prevent from forming newer stains.plus people seem to brush more often if they have a whitening paste than if they use a regular one.
Whitening toothpates are abrasive pastes which "scrape" off the outer layer of stained enamel. If used wisely and not too frequently (according to instructions provided by the manufacturer), they are effective and remove the stains quite adequately. Only when the user applied excessive amounts, or uses the paste more times than recomended or applied excessive pressure while brushing will they begin to have detrimental effects of the teeth resulting in erosion of the outer enamel layer which may even result in exposure of the dentin layer which may lead to dental sensitivity. In addition, excessive use may lead to the demineralization and softening of the enamel layer ultimately resulting in carious lesions (most commonly class 5 lesions in the facial ascpects of the anterior teeth.