“they actually get absorbed into the teeth and become more of those intrinsic stains,” warns Dr. Kahng. And that’s where the actual color of the teeth starts to dull or yellow. Like most ...

leaving behind intrinsic stains. This means the stains can’t be removed just by removing what’s on the surface.” How long ...

There are three primary categories of teeth discoloration: extrinsic, intrinsic, and age-related stains. Extrinsic stains affect the outer enamel layer of the tooth and are typically caused by ...

Additionally, whitening kits are created to address both intrinsic and extrinsic stains. "A moldable tray or strip that closely adheres to the teeth but won’t be too large to get on gum tissue ...