In patients with intrinsic or internal stains like incases of fluorosis it is very important to not do bleaching or whitening as this can worsen the defect. The white discolored patches can become worse or further stand out with bleaching. Also in cases with tetracycline of other medicinal stains which occur due to exposure to drugs when the teeth are in a formative stage do not respond to any kind of whitening treatment.
In such cases composite or tooth colored fillings are a very good chairside option. These are simple highly aesthetic fillings which can be completed in one sitting. If done well these can.