Classaesium Treakite

Fluorine

Mr. Greg walked into the supermarket with a gun, and threatened to kill the manager, until all the toothpaste stocks were handed over to him. The manager wasn't kiled.
Greg counted his stocks - 572. Then he emptied each into his mouth, not wasting a single molecule.
The task took over 13 days. When he finally emerged from the house, he ceased to be a human.
The teeth had expanded in sixteen directions, covering him in a humanoid structure of blistering white.
The abominable mass was slow in pace, and its destination was the home of Classy Treak.
Pestilence was ready.