Um, that's not the way it works. Bleaching your teeth only treats the symptom, and actually makes the problem worse- not better.
The yellow film is bacteria from your cheeks and gums sticking to your teeth. Hydrogen peroxide bleaches the teeth, but dries out those tissues and increases bacteria production. It accelerates the problem you are trying to solve. Go figure.
You want to hydrate and heal your mouth so you make less infection.
And if the ADA had any integrity at all they would educate you about that and dispute this claim.
