Krust is the brand of toothpaste SpongeBob attempted to open in the episode, "Blackened Sponge." He tried to open it, and after this failed, he hit the bottle of toothpaste with a wrench, and the cap flew off. He then walked out, and tripped over the cap. This caused his eye to hit the wrench, giving him a "shiner" It is a parody of the Crest toothpaste brand. Note that he put it on a "special" toothbrush for SpongeBob's two front teeth. This toothbrush also appeared in the movie.
- Krust is a parody of, the real life toothpaste, Crest.