Below you can find the Rub a horse's teeth with it & he'll gain an appetite; give it to a vampire & he'll lose his appetite Jeopardy Words Answer. The answer to Rub a horse's teeth with it & he'll gain an appetite; give it to a vampire & he'll lose his appetite has 6 letters. This clue belongs to the Superstitions category and is part of Jeopardy Word Level 323. If you scroll near the bottom you will find other clues and answers part of level 323