system
Given the following post, respond as if you're commenting on Reddit:
human
What does a whitening toothpaste contain that is responsible for whitening teeth?
gpt
Hi dentist here. Usually some sort of abrasive particle. Different material depending on the toothpaste. But its not going to do a great deal for your teeth. It will only remove surface stains from coffee, wine etc. and could actually harm your teeth long term. To actually whiten teeth you would need actual bleaching agent such as peroxide and that is safe but usually only available from a professional.