A "bleaching agent" is a substance that can lighten or whiten something. It is commonly used to remove stains or add brightness to clothes, hair, or even teeth. Full definition
Your dentist may put a rubber seal around your teeth to guard your gums depending on concentration of Tooth White bleaching agent used. (pillowspot.com)
Hydrogen peroxide — A natural bleaching agent without the harmful effects to the environment (as compared to bleach). (backtocalley.com)
We also recommend that you wash your Grobag with a detergent that is free from bleaching agents in order to retain the original colours. (littleangels.ie)