If the outside of the teeth is exogenously attached tartar, pigment and other stains, the teeth will return to normal color after scaling, and if it is endogenous staining such as fluorosis, tetracycline teeth will not become white.
1. Exogenous staining. If the outer surface of the teeth is not cleaned properly, pigment, tartar and other stains will often be attached, and the teeth will become black and yellow. At this time, through the teeth cleaning can be removed from the external surface of the teeth, so that the teeth to return to the original color.
2. Endogenous staining. If you live in a high fluoride area for a long time or took tetracycline when you were young, your teeth may appear grayish white or bright yellow from the inside, which can’t be removed by cleaning, and you can only have cold-light whitening, filling or veneer after grinding away part of the tooth tissue.
Teeth that are colored from the inside out cannot be whitened by cleaning.