We see kids in various scary Halloween costumes, many with yucky rotten teeth, like pirates and zombies. Then we see the kids binging on the candy the got on Halloween, and then, a little later, we see that their teeth look exactly like the rotten teeth from their costumes. And then the announcer reminds us to brush our teeth, especially after eating sugary treats, or else we could get scary rotten teeth in real life, permanently, which is even scarier than any of the scariest things we all see during Halloween.
(Hey, how about a Halloween-themed candy-bar-flavored toothpaste? No? Too yucky?)