"When it comes to teeth whitening, we're essentially addressing two types of stains: extrinsic and intrinsic," Kahng said.

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

Your smile is often one of the first things people notice about you, and keeping your teeth bright and stain-free can boost ...

The intrinsic tooth shade was visually graded ... and a total extrinsic facial tooth stain score ≥ 28 according to Lobene stain index. Teeth that were grossly carious, fully crowned, or ...