The colour of the teeth could change.
This depends upon a number of factors.
The intrinsic staining of teeth could occur due to certain diseases that are encountered before birth or during childhood.
On the other hand, extrinsic stains occur outside the teeth owing to a number of habits that a person acquires during his or her life.
In this episode Dr.Sandesh Mayekar elaborates on all the reasons associated with tooth staining.
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Fuente: Youtube / Sushruta