Amorta
From Tardis Wiki, the free Doctor Who reference
The Amorta were a single-celled telepathic creature from a pocket universe. They had the means of teleporting, the capability of using holographic disguises, and on one occasion the ability to send out a telepathic message over some distance in order to convince people they had toothache. Calcium was a precious element on their home world and at one point, while disguised as a dentist, they managed to acquire supplies of calcium through tooth extractions. (COMIC: Toothache!)
