Teeth Whitening: Frequently Asked Questions
Are whitening products more effective on teeth with stains of certain colors? Yes. Yellowish teeth respond well to bleaching, brownish-colored teeth respond less well, and grayish-hue or purple-stained teeth may not respond well to bleaching at all. Blue-gray staining caused by tetracycline is more difficult to lighten and may require up to 6 months of […]