I guess because it’s always done, and if it was included, then people wouldn’t pay any mind to the logo, because they’d think “probably only the teeth were whitened.”
Might also be that simply adjusting the brightness on a photo could end up whitening teeth even if that wasn’t the goal so that would be a difficult one to enforce without going all the way to “0 changes to the image at all”.
I guess because it’s always done, and if it was included, then people wouldn’t pay any mind to the logo, because they’d think “probably only the teeth were whitened.”
Might also be that simply adjusting the brightness on a photo could end up whitening teeth even if that wasn’t the goal so that would be a difficult one to enforce without going all the way to “0 changes to the image at all”.