Dental cleanings help remove plaque and tartar, but sometimes the stains still appear on our teeth in the layer below called the dentin. The whitening agent combines with oxygen from the air and spreads throughout the tooth and react with the discolored molecules in your teeth. This means that the entire tooth is whitened, even if the whitening gel isn’t in contact with every part of the enamel. It is safe, non-invasive, and effective whitening method.
You can learn more about how whitening works here!