Whitening toothpastes are not the same as over-the-counter tooth-whitening bleaches. Though many toothpastes contain a bleaching ingredient, it’s washed away fairly quickly in this form. For the best results, bleaches must stay in contact with the teeth for an extended period, as they do with a whitening strip or tray.
If you want to go beyond removing surface stains on the teeth and focus instead on lightening the overall color, a tooth bleaching product or kit is a more effective choice than a toothpaste. These products usually require regular applications for two to four weeks.
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