Yes. Yellowish teeth respond well to bleaching, brownish-colored teeth respond less 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 home treatments or several in-office appointments to successfully lighten. Teeth that have dark stains may be better candidates for another lightening option, such as veneers, bonding, or crowns. Your dentist can discuss the options and costs related to teeth whitening in Melbourne that best suited for your situation.