Our Common People attempt to avert the danger of chewing by placing under the chins of the dead a portion of recently excavated earth, lest they perhaps open their mouths and chew on the attached bands...
Others, who do not consider this a sufficiently safe measure, before the mouth of the dead is closed, also place a stone and a coin in the mouth, so that in the event that it begins to chew within the grave, it would find the stone and coin and would abstain from chewing. Which fact was witnessed in its time in a multitude of places in Saxonia by Gabriel Rollenhagen: Book IV Mirab. Peregrinat chapter 20, n. 5 in Kornmann.
The book is part of this Tuesday's episode of National Geographic Explorer called Vampire Forensics. Link -via Buzzfeed
Pretty neat nonetheless.