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How will I know if using a tray-based teeth whitening kit worked?

Since tray teeth whitening is intended to improve the look of your teeth -- rather than their health -- only you can judge whether you have achieved what you wanted. Dentists do have shade guides, which they can use to measure how much your teeth have been lightened. A dentist can also tell you what is likely to be achieved with continued bleaching.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.