Black Rock Shooter.
Seeing you asked me that question, it kinda reminds me of a part of the yotsuba manga.
Going in and out of the mouth while the white bubbly substance fills and cleans your gums and teeth.
The result is the pleasure of clean oral hygiene and minty cool breath.
If it is not what you expected. then Araragi Koyomi might be the best answer.
Who's there? (Well, i know it's you 2xd but still)
First of all, thank you for the question,my friend.
The seven dimensions has been distorted quite badly due to foreign elements.
But nonetheless, it was still good as ever.
