system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are so many types of toothpaste advertised as “whitening” toothpastes? Shouldn’t every type of toothpaste be cleaning and whitening your teeth regardless of the type?
gpt
"Whitening' toothpastes typically contain stronger abrasives and substances with the specific aim of attacking hard-to-break-down stains and changing color through chemical action. This is in addition to the contents of usual tooth paste, which is mostly concerned with breaking down plaque, minimizing decay, and freshening breath. This can certainly lead to an improvement of appearance, but not necessarily to the same scale if you've got significant coloring.