Shumitect is the name used in Japan for Sensodyne, the toothpaste brand marketed for sensitive teeth, and this clip comes from its television advertising style. Short brand jingles like this spread online because they are easy to recognise, easy to loop, and instantly change the mood of a scene. Japanese viewers share it for nostalgia, while international viewers use it as a random, official sounding insert. Its lasting appeal is that serious dental promise delivered in such a memorable, upbeat way.